I think so

💡 Grammar Rule

Expressions: “I think so,” “I think not,” “I suppose so”

1. Meaning

These expressions are short, natural ways to respond to a statement or question without repeating the whole idea.

I think so: You believe the statement is true.
I think not: You believe the statement is not true.
I suppose so: You are not completely sure, but you agree or accept the statement.

2. When to use them

You can use these expressions in everyday conversations when you want to show agreement, disagreement, or uncertainty in a polite and natural way.

Use I think so when you agree or believe the idea is correct.
Example: “Is it going to rain today?” — “I think so.”
Use I think not when you disagree or believe the idea is incorrect.
Example: “Did she mean to ignore you?” — “I think not.”
Use I suppose so when you agree but are unsure or not enthusiastic.
Example: “Do we have to leave now?” — “I suppose so.”

3. Notes

These expressions avoid repeating the full sentence. For example:
Instead of saying: “Yes, I think it will rain,” you can simply say: “I think so.”
I think not sounds polite and a bit formal. A more casual alternative is: “I don’t think so.”

Do you think it will rain today?

I think so.

Do you like this T-shirt?

I think so, it’s nice.

Is Ana coming to the party?

I don’t think so.

They say the bus comes soon.

I suppose so.

Are you sure about the address?

I think so, it’s this street.

I think the café is closed.

I think not, I see people inside.

Will the team win today?

I suppose so.

I think John is on vacation.

I think so, he told me yesterday.

Is this the right stop?

I think not, one more to go.

They say it’s sunny tomorrow.

I think so, I heard it on the radio.

Is your sister coming with us?

I suppose not, she’s busy.

I think this is the book you wanted.

I think so, thanks.

Do we need more bread?

I think so.

The train seems late.

I suppose so.

Is that your new phone?

I think not, it’s James’s.

I think the class starts at nine.

I think so, it’s always at that time.

Are we going the right way?

I suppose so.

They say the movie is very good.

I think so, everyone recommends it.

Is the dog in the yard?

I don’t think so, he’s inside.

I think we can finish today.

I suppose so, we’re doing well.

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