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Regular and irregular verbs: How past forms change

Why do some dictionaries list costed if cost stays the same in the past?

Regular past verbs use the suffix -ed or -d to express completed actions in past time. Irregular past verbs express past time through specific vowel or consonant changes, or by keeping an identical base form, rather than taking the regular suffix.

ポイント

  • English past verbs divide into regular verbs with -ed endings and irregular verbs that shift internally or stay unchanged.
  • Grouping related irregular patterns helps recall, while remembering that auxiliary did carries past tense prevents double-marking errors.
  • For regular verbs, add -ed or -d and check the spelling rules for final consonants and y.
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A woman at a table organizes identical leaves on one side and diverse geometric shapes on the other, illustrating regular and irregular patterns.

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理解

意味、使う場面、避けたい間違いを学びます。

例

Marcus organized the inventory yesterday and built two sturdy shelves.

この表現を使う理由: Organize is a regular verb adding -d, while build is an irregular verb changing d to t.

ほかの例を2件見る
  • We visited three apartments on Saturday and chose the unit near the park.

    Visit takes the regular -ed suffix, whereas choose shifts its vowel to chose.

  • The technician put new cables into the network box and left the building at five.

    Put keeps its base form in the past simple, while leave changes to left.

基本から解説を読む

8項目の短い解説と各1問の確認問題

Deciding When to Add -ed or -d

Most regular past forms add -ed; after a final e, add -d. After consonant plus y, change y to i before adding -ed. A one-syllable verb ending in one vowel letter plus one consonant letter normally doubles the consonant, except w, x, or y. Longer verbs normally double under this pattern when the final syllable is stressed. Some spellings, especially final l, vary between British and American English.

  • We stopped at the grocery store and picked up fresh vegetables.

    この表現を使う理由: Stop doubles the final p before -ed, while pick adds -ed directly.

  • She studied accounting in college and decided to join a local firm.

    この表現を使う理由: Study changes y to ied, and decide adds only -d.

自分で試す

Which sentence correctly spells the regular past forms?

答えを見る

答え: He dropped his pen and carried the boxes.

Drop ends in a single vowel and consonant, so the p doubles to dropped. Carry ends in a consonant plus y, which changes to ied.

Recognizing Vowel Changes in Common Verbs

Many common verbs change their vowel in the past simple. Write becomes wrote, speak becomes spoke, and drive becomes drove. Meet becomes met, and feed becomes fed. These groups can help you remember the forms, but there is no single rule for all irregular verbs. Use the established past forms rather than adding -ed.

  • Marcus wrote the final project proposal and spoke with our director.

    この表現を使う理由: Write changes to wrote, and speak changes to spoke in the past simple.

  • The committee met yesterday morning and chose a new chairperson.

    この表現を使う理由: Meet shortens its vowel to met, and choose becomes chose.

Regular past verbs: report what happened and what is readyとRegular Verbs: Master Everyday Endingsでこれをもう一度練習できます。

自分で試す

Which sentence uses the correct past simple forms for the actions?

答えを見る

答え: She drove to the warehouse and spoke to the logistics manager.

Drive changes to drove and speak changes to spoke. Adding -ed creates an error, and driven is a participle.

Identifying Verbs That Never Change Shape

Cut, put, hit, hurt, and set have the same base, past simple, and past participle forms. Cost also keeps its form when describing a price. In the separate sense of calculating or estimating an expense, use costed. Time expressions and the surrounding sentence help identify whether a form refers to past time.

  • Yesterday evening I put the extra keys in the cabinet and cut the parcel tape.

    この表現を使う理由: Both put and cut remain identical in the past simple.

  • The new laboratory equipment cost twelve thousand dollars.

    この表現を使う理由: Cost states the price paid, so it remains unchanged.

自分で試す

Which sentence correctly describes a past action without changing the verb?

答えを見る

答え: She put the signed documents on the desk and shut the office door.

Put and shut retain their base form in the past simple. Putted is an error, and cost expresses price without -ed.

Grouping Verbs That Shift From D to T

Grouping irregular verbs by shared sound transformations reduces the burden of memorizing long lists in isolation. One consistent family replaces a base final letter d with a crisp past final t. Verbs in this category include send which becomes sent, spend which becomes spent, lend which becomes lent, and build which becomes built. These verbs keep their root vowel while hardening their final consonant. Remembering this shared phonetic behavior allows you to apply the pattern reliably across related vocabulary.

  • Our marketing department spent three weeks on the survey and sent the results today.

    この表現を使う理由: Spend becomes spent and send becomes sent through the d-to-t change.

  • The engineering crew built a temporary ramp and lent us their safety helmets.

    この表現を使う理由: Build shifts to built and lend shifts to lent.

自分で試す

Choose the sentence that applies the d-to-t pattern correctly to both verbs.

答えを見る

答え: We sent the revised contract and spent three hours reviewing clauses.

Send and spend both change their final d to t in the past simple, producing sent and spent.

Distinguishing Past Simple From the Participle

Use saw, went, and did for past simple statements. To form a perfect tense, use a past participle after have, has, or had. In passive sentences, use a past participle after a form of be. In standard English, 'I seen the report' needs saw, and 'he has went home' needs gone. Saw and seen have different uses, as do went and gone.

  • I saw the architect at the entrance, but my colleague had already seen her inside.

    この表現を使う理由: Saw is the past simple alone; seen follows had in the past perfect.

  • They went to the regional branch after the headquarters had gone offline.

    この表現を使う理由: Went acts as the past simple verb; gone follows the auxiliary had.

自分で試す

Which sentence uses the past simple and participle forms accurately?

答えを見る

答え: Lucas saw the delivery van arrive, and our staff have already unpacked the boxes.

Saw is the correct standalone past simple verb, while unpacked is the correct participle following have.

Listening for Past Endings in Natural Speech

In conversational English, regular -ed endings sound like /t/ after voiceless consonants, /d/ after voiced sounds, and /ɪd/ only after the sounds /t/ or /d/. Because fluent speakers link consonant endings directly into a following vowel, an ending like the /t/ in walked becomes easier to hear before words like across or into. However, when an ending sits before another consonant, speakers often blend the sound into the next word. Training your ear on vowel-linked phrases prevents mishearing past actions as present verbs.

  • She walked across the courtyard and decided on a sunny bench.

    この表現を使う理由: Walked links smoothly into across, making the /t/ sound distinct.

  • The team agreed on the plan and started eight minutes later.

    この表現を使う理由: Agreed ends in /d/, while started adds an extra /ɪd/ syllable.

自分で試す

Which verb ending adds an extra syllable when pronounced in the past tense?

答えを見る

答え: decided

Decide ends in a /d/ sound, so adding -ed creates an additional syllable pronounced /ɪd/.

Avoiding the Double Past in Negatives and Questions

When you construct negative statements or questions in the past simple, the auxiliary did or didn't carries the past tense marker for the entire clause. Therefore, the main verb that follows must always return to its base infinitive form without -ed or vowel changes. A very common learner mistake is using a double past, such as saying 'did you went?' or 'we didn't bought it'. Always check that only the auxiliary shows past time while the main lexical verb stays uninflected.

  • Did you find your notebook, or did someone take it from the counter?

    この表現を使う理由: Both find and take stay in the base form after the auxiliary did.

  • We did not buy the second vehicle because we did not need extra seats.

    この表現を使う理由: Buy and need remain in base forms after did not.

自分で試す

Which sentence correctly frames a negative statement and question in the past simple?

答えを見る

答え: Did you see the presentation, or didn't you go to the auditorium?

After did and didn't, the verbs see and go must remain in their base forms.

Keeping Past Forms Consistent in Narratives

When telling a personal anecdote or writing a workplace incident report, you will naturally combine regular and irregular verbs across consecutive sentences. Maintaining tense consistency ensures that your listener can track the sequence of events without confusion. Avoid switching between present and past simple unless you are contrasting a past situation with an ongoing current state. Grouping your thoughts chronologically and double-checking irregular forms before speaking helps your narrative sound structured and effortless.

  • Yesterday our supervisor arrived at eight, opened the workshop, and briefed our crew.

    この表現を使う理由: All three verbs maintain past simple consistency across the chronological series.

  • We noticed the water leak, shut off the main valve, and called building maintenance.

    この表現を使う理由: Noticed and called are regular with -ed, while shut stays unchanged in past time.

自分で試す

Which paragraph keeps past tense consistency without switching forms incorrectly?

答えを見る

答え: Yesterday Clara walked into the office, picked up her mail, and answered messages.

All three verbs (walked, picked, answered) consistently use the past simple to narrate a series of completed actions.

自然な使い方

「past simple」の実際の使われ方

ニュートラル 職場でも友人との間でも、ほとんどの場面で使えます。

よく一緒に使われる言葉

  • yesterdayI visited my sister yesterday.
  • last weekWe built a small table last week.
  • on SaturdayShe chose a new book on Saturday.
  • last monthThey moved into their apartment last month.

「Regular and irregular verbs: How past forms change」に関する質問

Why do some dictionaries list costed if cost stays the same in the past?

Cost stays cost when it means having a particular price. Costed is the past simple and past participle when the verb means calculating or estimating a cost. That sense is not limited to calculations made before a project starts.

The replacement engine cost five hundred dollars.

Our project accountant costed the building plans before the committee approved them.

Can I say 'I seen him yesterday' in conversational English?

In standard English, saw is the only past simple form used on its own for finished actions. Seen is a past participle, which requires an auxiliary verb like have, has, or had in perfect tenses, or a form of be in passive constructions. Saying 'I seen him' is nonstandard and should be avoided in professional and academic writing.

I saw my doctor yesterday afternoon.

I have seen that instructional video twice already.

Do I change the main verb to the past form after didn't?

No. When you form a negative sentence in the past simple using did not or didn't, the auxiliary did already carries the past tense. The main verb that follows must remain in its base form. Saying 'I didn't went' or 'she didn't bought' is incorrect because the past marker is duplicated.

She did not go to the meeting yesterday.

We didn't buy the expensive tickets.

How do I know if an -ed ending sounds like /t/, /d/, or /ɪd/?

Look at the sound right before the suffix. If the base verb ends in the sounds /t/ or /d/, add an extra syllable pronounced /ɪd/, as in waited or decided. If the base verb ends in a voiceless sound like /k/, /p/, or /s/, pronounce the ending as /t/, as in walked. After voiced sounds, pronounce it as /d/, as in played.

He decided to stay home after he worked eight hours.

They listened to the presentation and agreed with the proposal.

最後に確認

これを覚えましょう

English past verbs divide into regular verbs with -ed endings and irregular verbs that shift internally or stay unchanged. Grouping related irregular patterns helps recall, while remembering that auxiliary did carries past tense prevents double-marking errors.

ステージ 2 / 5

聞く

実際の文の中で聞いて、聞こえた通りに書き取ります。文は短いものから順に長くなります。

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0 / 4完了

リスニング 1 / 4 4秒 Describing a colleague's walk across campus yesterday

聞いて、聞こえた通りに入力してください。必要なだけ再生できます。

大文字と句読点は採点に影響しません。

リスニング 2 / 4 4秒 Stating the price paid for office furniture purchased online

聞いて、聞こえた通りに入力してください。必要なだけ再生できます。

大文字と句読点は採点に影響しません。

もう少し長いクリップに挑戦しましょう。一度聞いて、聞き逃した部分を再生してください。

リスニング 3 / 4 9秒 Reporting on a colleague's successful project presentation

聞いて、聞こえた通りに入力してください。必要なだけ再生できます。

大文字と句読点は採点に影響しません。

このクリップは長めです。解答欄の上の指示に従ってください。

リスニング 4 / 4 23秒 Summarizing a productive workday and team lunch

音声を聞いて、空欄に入る単語を入力してください。それ以外の部分は表示されています。

Yesterday morning, our finished a major quarterly report and sent document over our network. We visited an open around noon and bought several warm for our colleagues. Later, Sophia spoke with our manager our schedule, while Liam checked our data on an screen. We enjoyed our afternoon because everyone each assignment early.

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話す

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シャドーイング

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書く

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Write a message of 30 to 50 words to your teammate explaining what you completed yesterday, what you bought for the office, and where you went before closing.

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