English conversation for beginners: Doubt and lack of opinion

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DOUBT AND LACK OF OPINION

I can’t tell you just/right now

How should I know!

I don’t know

I don’t know what to say.

I don’t quite know

I doubt his/her words

I doubt if / whether

I doubt it / I have my doubts

I have doubts about…

I have no opinion about it.

I have no opinion.

I haven’t got a clue

I know nothing about

I will not make any comment.

I wouldn’t be so sure.

I’d prefer not to comment on..

I’m not in position to answer.

I’m not sure

I’m not that sure

I’m speechless. / It leaves me speechless.

I’m still in the dark about

I’ve never thought about it.

If in doubt, … / When in doubt …

It is difficult to comment on…

It is not certain whether…

It is open to doubt whether…

It isn’t known for sure whether…

The truth is that …

There is still some doubt about/regarding…

Who knows.

You never know!

You tell me!