Phrasal verb
Fill out
What does 'fill out' mean?
'Fill out' means entering requested information into a paper or digital form, while it can also describe a face or body becoming fuller. For example, please fill out the booking form before your appointment. With pronouns, say 'fill it out' or 'fill them out', never 'fill out it'.
Key points
- 'Fill out' usually means completing information on a form.
- Use 'filled out' for completed past actions.
- Full nouns can follow 'out' or come between 'fill' and 'out'.
- Pronouns must come between 'fill' and 'out'.
Can you use "Fill out" yourself?
This lesson has 5 stages. You can stop at any time and continue later.
Stage 1 of 5
Understand
What it means, when to use it, and mistakes to avoid.
The full explanation
Fill out primarily means to enter requested details into the blank spaces of a paper document or digital form. A secondary meaning describes a person's face or body becoming fuller, rounder, or more mature over time.
Please fill out the visitor questionnaire before leaving the gallery.
Why it works: The speaker asks the visitor to enter their feedback into the blank fields of the document.
2 more examples
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I found the medical registration form online and filled it out immediately.
The pronoun it sits between filled and out to describe a completed action.
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His thin face filled out after three months of nutritious home meals.
Here filled out is used without an object to describe facial features becoming fuller and healthier.
Read the full guide
Decide when a document needs information
A form is a paper sheet or web page with blank spaces where an organization asks for personal details or answers. When you write your name, address, or answers in those spaces, you fill out the form. Filling out refers only to entering the details into the required spaces. It does not mean signing your name or sending the document to an office. You can fill out an application form for a job, fill out a questionnaire to share your opinion, or fill out one single section of a medical record.
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Please fill out the application form before Friday.
Why it works: The applicant must enter personal details into the blank spaces of the job document.
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Every visitor filled out a short questionnaire about the museum visit.
Why it works: Questionnaire means a list of written questions used to collect opinions or facts.
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You only need to fill out the contact section today.
Why it works: This instruction specifies completing one exact part of the document rather than the whole page.
Your turn
What does a student do when they fill out an enrollment form?
Answer: They write or type the requested information in the spaces.
Show the answer
Answer: They write or type the requested information in the spaces.
Filling out a form means entering the required facts into the spaces. Signing and handing the form in are separate actions.
Ask where to enter your details
When you arrive at a new studio or workshop, staff members often hand you a clipboard or point to a tablet screen. You can ask directly where they want your information before you start your lesson. In everyday conversation, people use fill out to ask whether they should write on paper or type on a screen. If you already see the tablet on the counter, you replace the noun phrase with the pronoun it.
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Do I fill it out here on this tablet?
Why it works: The speaker asks where to enter their registration information.
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You can fill out the waiver at the front counter.
Why it works: The instructor indicates the physical spot where the learner should complete the form.
This also comes up in Get over and Get out of something.
Your turn
In the pottery studio dialogue, what does the organizer want Elena to do on the tablet?
Answer: Type her emergency contact details into the registration screen.
Show the answer
Answer: Type her emergency contact details into the registration screen.
The organizer asks Elena to enter her emergency details on the tablet screen instead of using a paper sheet.
Choose between noun and pronoun positions
When the object is a full noun phrase, English gives you two correct choices for word order. You can say fill out the registration form, or you can place the noun phrase in the middle and say fill the registration form out. Because another word can sit between fill and out, teachers call this phrasal verb separable. However, this flexibility stops when you use a pronoun such as it or them. Pronoun objects must always stand in the middle: fill it out and fill them out. Saying fill out it or fill out them is a grammar mistake that native listeners immediately notice.
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Please fill the registration form out before class starts.
Why it works: The full noun phrase sits between the verb and the particle, which is completely natural.
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I received the survey by email, so I will fill it out tonight.
Why it works: The pronoun it must sit between fill and out; saying fill out it is incorrect.
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Here are two feedback cards; please fill them out after the demonstration.
Why it works: The plural pronoun them must go between fill and out.
Your turn
Which sentence places the pronoun in the correct position?
Answer: Take this survey card and fill it out before noon.
Show the answer
Answer: Take this survey card and fill it out before noon.
Pronoun objects such as it and them must sit between fill and out. Fill out it is never correct in standard English.
Form past tense statements and questions
The verb fill changes its endings just like other regular verbs, while the word out never changes. You write fill out for simple present with I, you, we, and they; fills out for he, she, and it; filled out for simple past; and filling out for continuous tenses. Notice that both l letters remain in filled and filling. When you build past questions or negative sentences with did or didn't, always return the verb to its base form fill. Say Did you fill it out? and I didn't fill it out. Never say Did you filled it out or I didn't filled it out.
| Structure | Correct Form | Common Mistake to Avoid |
|---|---|---|
| Present simple | She fills out the sheet. | She fill out the sheet. |
| Past simple statement | I filled out the sheet. | I fill out the sheet yesterday. |
| Past question | Did you fill it out? | Did you filled it out? |
| Past negative | I didn't fill it out. | I didn't filled it out. |
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Could you fill it out before you leave the reception desk?
Why it works: Could creates a polite request and takes the base verb fill.
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Did you fill it out on your phone yesterday?
Why it works: Past questions with did require the base form fill out, not filled out.
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I did not fill it out because my internet connection dropped.
Why it works: The negative auxiliary did not requires the base form fill.
Your turn
Which question correctly asks about a completed paper from yesterday?
Answer: Did you fill out the health declaration?
Show the answer
Answer: Did you fill out the health declaration?
The auxiliary did already carries the past tense, so the main verb must remain in its base form fill out.
Distinguish fill out from fill in and fill up
In American English, people almost always say fill out a form when they talk about completing the entire document. In British English, both fill out and fill in a form are common and natural. However, both dialects use fill in when talking about one single blank space, such as filling in your date of birth or filling in a box. In formal business or legal situations, you will often see complete the form instead. Be careful with fill up. Fill up means making a physical container full of liquid or items, such as filling up a water bottle or a car's fuel tank. Saying fill up a form sounds like you are pouring water on paper.
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Please fill in your postal code in box four.
Why it works: Fill in is used for a single blank space or individual detail on a page.
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All new employees must complete the tax document before their start date.
Why it works: Complete the document offers a formal alternative to fill out in workplace policies.
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I need to fill up my water jug before the pottery class begins.
Why it works: Fill up applies to physical containers that hold liquids or objects, never to documents.
Your turn
Which sentence uses fill up correctly?
Answer: He went to the petrol station to fill up his car tank.
Show the answer
Answer: He went to the petrol station to fill up his car tank.
Fill up means to make a physical container full. It is never used for entering details on a form or questionnaire.
Recognize changes in facial or body shape
Sometimes you will encounter fill out without any document or object following it. In this second meaning, fill out describes a person or a part of the body becoming fuller, rounder, or more mature over time. For instance, as children grow into teenagers or adults, their facial bones and features develop, so you might read that someone's face filled out over the summer. This expression is neutral and describes natural physical development. Because there is no paper or digital form receiving information, there is no object after the phrasal verb.
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His jawline broadened and his cheeks filled out as he grew older.
Why it works: Filled out here describes a natural physical transition toward a rounder or fuller face.
-
During his final year at university, his slim frame filled out noticeably.
Why it works: Without a document object, the verb describes a person becoming heavier or more solid.
Your turn
What does it mean if an author writes, 'After a year of healthy meals, the athlete's face filled out'?
Answer: The athlete's face became fuller and less thin.
Show the answer
Answer: The athlete's face became fuller and less thin.
Without an object, fill out describes someone's face or body becoming rounder, fuller, or healthier over time.
Hear linked sounds in fast speech
In natural spoken English, words that end in a consonant link smoothly into words starting with a vowel. In the phrase fill out, the /l/ sound at the end of fill /fɪl/ glides directly into the vowel /aʊt/, sounding like /fɪ-laʊt/. When speakers use the past tense, filled /fɪld/ remains one single syllable, and the final /d/ sound joins out to produce /fɪl-daʊt/. If speakers speak quickly, the /d/ can sound light, so listen for time words like yesterday or last week to confirm the past tense. Be sure to distinguish short /ɪ/ in fill from long /iː/ in feel. In addition, sentence stress varies depending on rhythm and emphasis; never assume or promise that out is always stressed, because stress patterns shift naturally in conversation.
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They fill out an attendance card every morning.
Why it works: Notice how the final /l/ of fill links smoothly into out as /fɪ-laʊt/.
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She filled out eight questionnaires during the morning session.
Why it works: The one-syllable word filled connects its ending /d/ directly to the vowel in out.
Your turn
How many syllables does the word filled contain in natural English speech?
Answer: One syllable (/fɪld/).
Show the answer
Answer: One syllable (/fɪld/).
The regular past tense filled is pronounced as a single syllable (/fɪld/). It rhymes with build and chilled.
Rebuild sentences from memory
Testing your recall without looking back at the rules helps cement both the meaning and word order. Work through these four concrete retrieval prompts: 1. Meaning choice: In the sentence 'Her face filled out during the holiday,' does the verb mean completing a document or becoming rounder? (Check answer: becoming rounder). 2. Pronoun substitution: Replace the noun phrase in 'Please fill out the registration sheet' with the pronoun 'it'. (Check answer: 'Please fill it out'). 3. Pronoun error repair: Correct the mistake in 'I received the link and will fill out it tonight.' (Check answer: 'I received the link and will fill it out tonight'). 4. Request formation: Create a polite request asking someone to complete a form on a tablet using 'could you'. (Check answer: 'Could you fill it out on the tablet?'). After reviewing these check answers, cover the page and complete a final attempt from memory without looking. For related listening practice with administrative forms and library cards, review /micro-listenings/9-2/, /micro-listenings/8-2/, and booking confirmations in /micro-listenings/6-2/.
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Could you fill it out on your tablet while we prepare your clay?
Why it works: This sentence correctly combines a polite could request with the required pronoun order.
-
I need you to fill this medical record out before the doctor calls you.
Why it works: The noun object separates fill and out naturally.
Your turn
How should you repair the sentence: 'When you get the email, please fill out it'?
Answer: 'When you get the email, please fill it out.'
Show the answer
Answer: 'When you get the email, please fill it out.'
A pronoun object like it must always go between fill and out: please fill it out.
Other meanings of "fill out"
This lesson practises one meaning. You may also hear these.
Become fuller, rounder, or more mature in the face or body.
Her cheeks filled out during her recovery.
Common mistakes with "fill out"
What learners often say, what to say instead, and why.
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Not this:
Please fill out it before lunch.Say: Please fill it out before lunch.
Pronoun objects must come between 'fill' and 'out'.
-
Not this:
Did you filled out the application?Say: Did you fill out the application?
'Did' takes the base verb 'fill', not 'filled'.
-
Not this:
I didn't filled out the online form.Say: I didn't fill out the online form.
'Didn't' already marks the past, so use the base form 'fill'.
-
Not this:
Please fill up the registration form.Say: Please fill out the registration form.
'Fill up' is for making physical containers full; forms take 'fill out'.
Use it naturally
How people really use “fill out”
Neutral Fine almost anywhere, at work or with friends.
Words it often goes with
- fill out a formYou need to fill out a form to report your missing bag.
- fill out a questionnairePlease fill out a questionnaire about your visit.
- fill out an applicationI need to fill out an application for the summer program.
- fill out a surveyCould you fill out a survey about the new bus service?
What people also say
- “I filled it out.” instead of “I filled out it.” Put a pronoun like it between fill and out.
Questions about "Fill out"
What does fill out mean?
Fill out usually means writing or typing your personal details into blank spaces on a document or digital page. It can also describe a person's face or body becoming fuller or more rounded as they grow.
Please fill out this registration page with your contact details.
His face filled out over the summer break.
Should I say fill out it or fill it out?
You must say fill it out. When the object of this phrasal verb is a pronoun like it or them, English grammar requires the pronoun to sit directly between fill and out. Saying fill out it is incorrect in standard English.
I have the survey, and I will fill it out tonight.
Here are two cards; please fill them out before leaving.
Is fill in a form also correct?
Yes, fill in a form is widely used and completely standard, especially in British English. In American English, fill out is the standard phrase for an entire document, while fill in often refers to writing information into one specific box or blank line.
British speakers often ask people to fill in an application.
Please fill in your current phone number on line three.
Can I say fill up a form?
No. In both American and British English, fill up means to make a physical container full of liquid or solid objects. Using fill up for a paper or digital document sounds incorrect, as if you are pouring liquid onto the paper.
We need to fill up the gas tank before our drive.
Do not say fill up the form; use fill out instead.
What is the past tense of fill out?
The past tense is filled out. Because fill is a regular verb, you add -ed to fill, while the word out remains unchanged. Keep both l letters in filled. When asking questions with did or negatives with didn't, return to the base form fill out.
She filled out the medical history form yesterday.
Did you fill out the application on your computer?
What does it mean when someone's face fills out?
When someone's face fills out, it means their facial features become rounder, fuller, or less thin. This is an intransitive use with no direct object, describing natural physical growth or weight gain over time.
As he recovered from the illness, his cheeks filled out.
Her face filled out naturally during her early twenties.
Before you go
Remember this
Use fill out to describe entering information into documents or screens, and place pronoun objects directly between fill and out. Use filled out for past statements, but return to fill out after did and didn't. Remember that fill up is reserved for physical containers, and a person's face fills out when it becomes rounder over time.
Stage 2 of 5
Listen
Hear it in real sentences, from short to long, and write what you hear.
0 of 4 done
Listening 1 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- I found the medical registration form online and filled it out immediately.
- His thin face filled out after three months of nutritious home meals.
Read the transcript
You can take this card home and fill it out online.
The pronoun it sits directly between fill and out because pronouns cannot follow out.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill it, listen for "fil-lit" as the l joins the start of it.
- In it out, listen for "i-tout" as the t joins the start of out.
- In out online, listen for "ou-tonline" as the t joins the start of online.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill it, listen for "fil-lit" as the l joins the start of it.
- In it out, listen for "i-tout" as the t joins the start of out.
- In out online, listen for "ou-tonline" as the t joins the start of online.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill it, listen for "fil-lit" as the l joins the start of it.
- In it out, listen for "i-tout" as the t joins the start of out.
- In out online, listen for "ou-tonline" as the t joins the start of online.
Listening 2 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- I found the medical registration form online and filled it out immediately.
- His thin face filled out after three months of nutritious home meals.
Read the transcript
His pale cheeks filled out gradually after he rested.
When used without a document object, filled out describes a face becoming fuller or healthier.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In filled out, listen for "fille-dout" as the final d joins the start of out.
- In out gradually, listen for "ou(t) gradually" with a faint or missing t.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In filled out, listen for "fille-dout" as the final d joins the start of out.
- In out gradually, listen for "ou(t) gradually" with a faint or missing t.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In filled out, listen for "fille-dout" as the final d joins the start of out.
- In out gradually, listen for "ou(t) gradually" with a faint or missing t.
Try a longer clip. Listen once, then replay the part you missed.
Listening 3 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- I found the medical registration form online and filled it out immediately.
- His thin face filled out after three months of nutritious home meals.
Read the transcript
Please fill out a paper survey before you go, or fill it out on our website if you prefer using your mobile phone.
The speaker uses fill out with a full noun phrase and fill it out when referring back with a pronoun.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill out, listen for "fil-lout" with no pause between the words.
- In out a, listen for "ou-ta" as the t joins the short a sound.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill out, listen for "fil-lout" with no pause between the words.
- In out a, listen for "ou-ta" as the t joins the short a sound.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In fill out, listen for "fil-lout" with no pause between the words.
- In out a, listen for "ou-ta" as the t joins the short a sound.
- The last sound of the first word runs straight into the next word.
This clip is longer. Follow the instruction above the answer field.
Listening 4 of 4
Listen, then type the missing words. The rest of the text is already there.
0:00
- I found the medical registration form online and filled it out immediately.
- His thin face filled out after three months of nutritious home meals.
Read the transcript
Welcome to our ceramics room. Be sure to fill out a paper waiver before touching any equipment, or you can fill it out on a studio tablet near our entrance. Please answer every question about safety rules, and sign your name clearly below before joining our group.
The instructor uses fill out a paper waiver for the full noun phrase and fill it out for the pronoun form.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
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Save my progressStage 3 of 5
Speak
Say it with the speaker, then use it in your own answer.
Shadow
Say it along with the speaker
You can take this card home and fill it out online.
Play the line slowly, then speak at the same time as the speaker. Copy the rhythm, not just the words.
Your turn
Say it your way
Speak for 30 to 60 seconds from memory. You lost your backpack at a library. Tell a friend about the lost item form, what details it asks for, and why you need help completing it.
Use: fill out fill it out filled out
Think for ten seconds, then answer out loud for as long as the task above asks, without looking at the lesson. Nothing is sent unless you ask for feedback.
0:00
Hear how someone else might say it
I left my backpack at the library yesterday, and I need to fill out a lost item form. It asks for the color, size, and things inside the bag. I can fill it out at home, but I need your help with one detail. Do you remember the name on the front of my backpack? I already filled out the part with my name and phone number. Once I add the last detail, I can send the form to the library. Maybe someone has found my bag.
Try once more and answer this: What did you have inside your backpack?
Stage 4 of 5
Write
Write about your own day or week using it, then write a message.
Write
Put it in your own words
- I used “fill out”.
- It is about my life, not the lesson’s example.
- I read it once aloud to check it sounds right.
Write your own response
Choose a situation and write 30–50 words in your own wording. This is separate from typing the exact words in a recording.
Check your own writing
Read one possible response
Use these checks to revise your message. Grammar and meaning are not automatically graded. Each task keeps its own draft in this browser tab.
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