Sentence examples for not sure if from inspiring English sources

"not sure if" is a perfectly acceptable and commonly used phrase in written English, meaning "I do not know for certain whether or not [something is true]." For example: I'm not sure if the store is open today; I'll have to call and check.

Exact(60)

I'm not sure if it does.

The New York Times

Not sure if it's comedy?

The New Yorker

Not sure if your company matches?

Columbia University

I'm not sure if she appreciates it.

The New York Times - Sports

Not sure if you're eligible to vote?

The New York Times

I'm not sure if I believe it!

Independent

I'm not sure if we had dinner.

The New York Times

We're not sure if this qualifies?

The Guardian

I'm not sure if I agree.

The Washington Post

I'm not sure if that was achieved.

The Guardian - Lifestyle

But I'm not sure if they're right".

The New York Times

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