English conversation for beginners: Doubt and lack of opinion

English conversation for beginners: Doubt and lack of opinion

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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!


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