Micro-listening
Adverbs of reason: link cause and result
The short answer
Adverbs of reason and result show that a second statement follows logically from a first statement. When you use words such as therefore, consequently, thus, or hence, you present an outcome or decision based on facts your listener already heard. In contrast, because introduces the cause itself.
Key points
- Knowing whether you are presenting the origin of an event or its outcome determines which word you should choose.
- Identify whether your next clause states a cause or an outcome before you speak or write.
- Use because to explain the cause directly.
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.
Examples
The delivery truck broke down; therefore, the morning orders arrived late.
Why it works: The broken truck is the known cause. Therefore introduces the late delivery as the outcome.
3 more examples
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The manager approved overtime because the warehouse received sixty extra crates.
Because introduces the cause of the overtime rather than the result.
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Heavy rain flooded the access road. Consequently, our technician rescheduled the repair.
Consequently begins a new sentence to explain the outcome of the flooded road.
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The client requested an earlier launch date; thus, our team adjusted the production schedule.
Thus shows the direct operational change that followed the client request.
Read the full guide
Separate the Cause from the Result
Before choosing a linking word, decide which event happened first and caused the other. When you share two linked events, one event provides the reason and the second event describes the outcome. If you state the reason first, a transition word signals that the listener should expect an outcome. Confusing these roles can reverse your message and confuse your coworkers or clients.
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The computer server lost power. Therefore, our staff logged out of the system.
Why it works: The power cut happened first and caused the staff to log out.
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Our staff logged out of the system because the computer server lost power.
Why it works: The sentence starts with the outcome and uses because to name the reason.
Your turn
In the sentence 'The supplier increased prices; therefore, the cafe adjusted its menu,' which part is the result?
Answer: The cafe adjusted its menu
Show the answer
Answer: The cafe adjusted its menu
The price increase is the trigger that caused the cafe to change its menu. Therefore points forward to this resulting action.
Introduce an Outcome with Therefore
Use therefore when your listener already understands the background fact and you want to present the logical outcome. This adverb often appears in workplace emails, meeting notes, and project summaries where clear logical steps matter. You must place therefore before the result, never before the underlying reason. Placing it in front of the reason creates an incorrect statement.
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The inventory count was inaccurate. Therefore, we paused all shipping orders.
Why it works: The pause in shipping is the business decision resulting from the bad count.
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The flight was delayed; therefore, Maria missed her morning presentation.
Why it works: Missing the presentation directly follows the delayed flight.
You can practise this again in Bring about and Adverbs of Frequency: Word Order and Rules.
Your turn
Which sentence uses therefore correctly to introduce a logical outcome?
Answer: The presenter felt sick; therefore, the workshop ended early.
Show the answer
Answer: The presenter felt sick; therefore, the workshop ended early.
The illness is the cause that occurred first, and ending the workshop early is the outcome that follows therefore.
State a Direct Cause with Because
When you want to explain why something took place in a single fluid sentence, use because. Unlike result adverbs, because connects directly to the cause itself. You can place the because clause at the beginning of the sentence or at the end without using semicolons. This flexibility makes because ideal when explaining reasons behind decisions or delays to customers.
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Our team rescheduled the call because the client needed more preparation time.
Why it works: Because introduces the specific reason for moving the call.
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Because our inventory arrived early, we fulfilled five extra customer requests.
Why it works: The cause clause appears first, followed by a comma and the main outcome.
Your turn
Choose the sentence that correctly explains a delay using because.
Answer: We missed our morning connection because the local train arrived twenty minutes late.
Show the answer
Answer: We missed our morning connection because the local train arrived twenty minutes late.
Because correctly joins the main result clause to the clause stating the reason without redundant adverbs or broken prepositions.
Connect Closely Related Sentences with a Semicolon
When two complete thoughts are closely linked in meaning, you can join them in a single sentence using a semicolon before the result adverb. Follow the adverb with a comma to separate it from the result clause. A semicolon shows readers that the two ideas belong together as one continuous thought, which keeps professional writing compact and organized.
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The budget report was incomplete; therefore, the finance director requested revised figures.
Why it works: The semicolon links the two independent clauses without creating a run-on sentence.
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The store ran out of printer paper; consequently, staff purchased boxes nearby.
Why it works: The semicolon before consequently and comma after it maintain correct formal boundaries.
Your turn
Which sentence shows the correct punctuation for linking clauses with therefore?
Answer: The software license expired; therefore, we renewed it this morning.
Show the answer
Answer: The software license expired; therefore, we renewed it this morning.
A semicolon marks the end of the first complete clause, and a comma sets off therefore from the second clause.
Begin a New Sentence with a Result Word
Starting a new sentence with Therefore or Consequently gives your message a deliberate, measured pace. Put a period at the end of the cause statement, capitalize the result adverb, and place a comma directly after it. This structure works especially well when either the cause or the result sentence contains multiple details that would make a single combined sentence too long.
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Several key participants were stuck in regional transit. Therefore, the organizer postponed the opening speech.
Why it works: A period divides the detailed cause from the outcome, improving readability.
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Our office heating system broke during the frost. Consequently, everyone worked remotely on Friday.
Why it works: Consequently opens the second sentence to announce the workplace response.
Your turn
Why would a writer split a cause and result into two distinct sentences using a period?
Answer: To keep long, complex explanations easy to read and grammatically clear
Show the answer
Answer: To keep long, complex explanations easy to read and grammatically clear
Dividing detailed thoughts with a period prevents sentences from becoming overly long and difficult to parse.
Select Consequently or Thus in Formal Reports
Consequently introduces a result of an earlier action or situation. It can describe a good or bad result and does not mean that the result was inevitable. Thus can introduce a logical conclusion or mean in this way. These words fit formal reports; so is a more conversational choice.
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The technician skipped the safety inspection; consequently, the machine overheated by noon.
Why it works: Consequently emphasizes the negative outcome caused by skipping the inspection.
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The company lowered production costs; thus, retail prices dropped across the region.
Why it works: Thus shows the logical outcome of the cost reduction.
Your turn
Which word best emphasizes an inevitable outcome or consequence in a formal workplace report?
Answer: Consequently
Show the answer
Answer: Consequently
Consequently fits formal workplace reporting and draws attention to an outcome resulting from prior actions.
Switch to So in Casual Conversation
While adverbs such as therefore and thus look natural in writing, they can sound stiff during casual spoken English. In everyday dialogue, English speakers use the coordinating conjunction so to express the exact same relationship. Using so maintains the cause-then-result order without making your speech sound rehearsed or academic. Use a simple comma before so when joining two short clauses.
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It started raining on our walk, so we ducked into a nearby cafe.
Why it works: So provides a smooth, conversational bridge from the rain to the shelter.
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The printer is out of ink, so I will email you the document instead.
Why it works: So explains the practical everyday adjustment without sounding overly formal.
Your turn
Which sentence sounds most natural in casual spoken English with a coworker?
Answer: I lost my badge, so security issued a temporary pass.
Show the answer
Answer: I lost my badge, so security issued a temporary pass.
So is the standard conversational choice for expressing results in daily spoken English.
Avoid Comma Splices at Sentence Boundaries
A frequent error among intermediate writers is connecting two complete sentences with only a comma before therefore. This error is known as a comma splice. Because therefore is an adverb rather than a coordinating conjunction like and or but, it cannot join independent clauses on its own. You must place either a semicolon or a period before the adverb to keep the sentence structure sound.
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Incorrect: The delivery arrived late, therefore we rescheduled the review.
Why it works: Joining two full clauses with only a comma before therefore creates a comma splice.
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Correct: The delivery arrived late; therefore, we rescheduled the review.
Why it works: The semicolon correctly separates the two independent clauses.
Your turn
How can you fix the error in 'The store closed early, therefore we could not buy supplies'?
Answer: Replace the comma before therefore with a semicolon or period
Show the answer
Answer: Replace the comma before therefore with a semicolon or period
Replacing the comma with a semicolon or period properly separates the two independent clauses and eliminates the comma splice.
Use it naturally
How people really use “therefore”
Formal Fits reports, emails to clients and speeches.
Words it often goes with
- therefore decidedWe wanted to learn about space and therefore decided to visit the science museum.
- therefore neededThe group had twelve people and therefore needed two guides.
- therefore choseMaya enjoys painting and therefore chose the art museum.
What people also say
- “It was raining, so we stayed inside.” instead of “It was raining; therefore, we stayed inside.” So sounds more natural in casual conversation.
Questions about "Adverbs of reason: link cause and result"
Can I put a comma before therefore when connecting two sentences?
No, using only a comma before therefore to connect two independent sentences creates a comma splice. Because therefore is an adverb rather than a coordinating conjunction, you must place a semicolon or a period before it. In formal writing, place a comma after therefore to separate it from the result clause.
The road was icy; therefore, the bus moved slowly.
The road was icy. Therefore, the bus moved slowly.
What is the difference between therefore and so in daily communication?
Both words show a result coming from a previous cause. However, therefore is formal and primarily appears in business reports, essays, and written documentation. So is a conjunction used constantly in everyday conversation. While therefore takes a semicolon or period, so connects clauses with a simple comma.
We completed the audit early, so our manager let us go home.
The company completed the audit early; therefore, management approved the release.
Can I begin a sentence with the word because?
Yes, you can begin a sentence with because, as long as you complete the full thought with an independent clause. When the because clause comes first, put a comma at the end of that clause before writing the main result. In casual speech, people sometimes say because on its own as a short answer, but full sentences require a result.
Because our train arrived early, we grabbed a cup of coffee before the meeting.
How do thus and hence differ from therefore in workplace writing?
Thus and hence are formal connectors that indicate results or logical deductions. Thus often means 'in this way' or 'as a direct consequence,' while hence traditionally means 'for this reason' or 'from here.' Both words sound elevated and are much less common in casual emails than therefore.
The software updates automatically; thus, our team saves hours of manual maintenance.
Before you go
Remember this
Identify whether your next clause states a cause or an outcome before you speak or write. Use because to explain the cause directly. Use therefore or consequently to announce the outcome, and protect sentence boundaries with a semicolon or period. For casual speaking, so delivers the same result connection with less formality.
Stage 2 of 5
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Say it your way
Speak for 30 to 60 seconds from memory. You and a friend can visit either a science museum or an art museum on vacation. Choose one. Explain your interests, your reasons, and what you will do there.
Use: therefore because
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I would choose the science museum because I love learning how things work. My friend enjoys space and wants to learn more about the moon. The science museum has a whole floor about space; therefore, it would be a good choice for both of us. First, we could look at the rockets and try some activities. Then we could watch a film about the planets. I would also like to visit the room about electricity. We could take photos and talk about our favorite parts over lunch.
Try once more and answer this: Which part of the museum would you visit first?
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Put it in your own words
- I used “therefore”.
- It is about my life, not the lesson’s example.
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