Language Focus: suppose
Meaning, structures, and everyday expressions
The verb suppose is used to talk about assumptions, expectations, and imaginary situations. It also appears in several very common expressions in everyday English.
Quick Look
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suppose = think or assume
- I suppose the package arrived while we were out. It certainly wasn't here before we left.
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I suppose so = uncertain agreement
- Should we leave early to beat the traffic?" — "I suppose so; it's a bit early, but better safe than sorry.
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I suppose not = uncertain disagreement
- I wonder if there'll be any food left — "I suppose not, since we're an hour late for the dinner party.
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is/was supposed to = expectation or rule
- The technician was supposed to call me this morning, but I never got her call.
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supposed to be = expected identity/state
- This painting is supposed to be an original Picasso; But I'm no expert, so I really can't tell.
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supposing = hypothetical situation
- Supposing we don't get the grant money; will we have to kill the research project?
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supposed = believed-to-be, claimed, so-called
- After further investigation, the supposed burglar was released for lack of evidence.
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suppose… = imagine / consider
- Suppose you won the lottery tomorrow; would you quit your job immediately?
1. suppose = think or believe (not strongly)
Speakers often use suppose when they believe something is probably true, but they are not completely certain.
I suppose he’s at work.
I suppose you’re right.
She supposes they already left.
We had supposed the meeting was canceled.
2. I suppose so / I suppose not
These short responses are very common in conversation.
“Will they come?” — I suppose so.
“Can we finish by tonight?” — I suppose not.
“Are you ready?” — I suppose.
These replies often sound slightly uncertain or reluctant.
3. suppose (that)
The word that is optional and often omitted.
I suppose (that) you’re tired.
She supposed (that) he knew the truth.
We had supposed (that) the train left at noon.
4. is/was supposed to
This structure expresses expectation, rules, or plans.
The train is supposed to leave at noon.
He was supposed to call me yesterday.
I’m supposed to meet her at six.
You’re supposed to finish the report today.
5. is/was supposed to be
Used when something has an expected identity or condition.
This is supposed to be a quiet place.
The movie is supposed to be very good.
He was supposed to be the leader.
The meeting was supposed to be short.
6. not supposed to
Used for rules or things that are not allowed.
You’re not supposed to park here.
We’re not supposed to talk during the exam.
I wasn’t supposed to see that.
7. supposing (that)
Supposing introduces a hypothetical situation, similar to what if.
Supposing it rains, what will we do?
Supposing he refuses to go?
Supposing they agree, we'll have the contract ready.
8. suppose… (imagining a situation)
Often used when explaining ideas or discussing possibilities.
Suppose you win the lottery.
Suppose the price doubles.
Let’s suppose the company loses money.
Suppose someone steals your phone.
9. What do you suppose…?
This structure is used when wondering or speculating.
What do you suppose he wants?
Who do you suppose told them?
Why do you suppose they left early?
10. supposed = believed-to-be, claimed, so-called
In more formal English, supposed can mean alleged or so-called.
The supposed thief escaped. (alleged)
The supposed cure did nothing. (claimed)
The supposed shortcut took an extra hour! (so-called)
The supposed miracle turned out to be an elaborate prank.(believed-to-be)
Common Collocations
- I suppose
- I suppose so
- I suppose not
- is/was supposed to do
- is/was supposed to arrive
- is/was supposed to meet
- suppose that
- let’s suppose
Quick Summary
- suppose = think or assume
- I suppose so = uncertain agreement
- I suppose not = uncertain disagreement
- is/was supposed to = expectation or rule
- supposed to be = expected identity/state
- supposing = hypothetical situation
- supposed = believed-to-be, claimed, so-called
- suppose… = imagine / consider