Being sure.
I'm sure / certain (that) (he will come / ...)
-There is no doubt about it.
-No doubt (you'd like to see your gift / ...)
-I certainly think / believe that (she was unhappy / ...)
-I'm positive on that point.
I'm certain...
-It is obvious that ...
-That goes without saying.
-It's crystal clear.
-It's as sure as two and two make four.
Being less sure.
-I think so
-I think that ( they will be there by 6 / ...)
-I suppose so.
-I suppose / expect that ( it is the way to the bus stop /...)
-I believe that ( he is sick / ...)
-I assume (that ) (they did it / ...)
-It's more than probable that ...
-I wouldn't be surprised if ....
Being unsure.
I'm not sure (that) ...
-I wonder if...
-I doubt if ...
-May be / perhaps (they're right / ...)
-It's very doubtful whether (he'll accept / ...)
-There's a little chance of ( arriving in time / ...)
-It isn't known for use ...
Not knowing.
-I don't think so.
-I don't think that (they will give her a ring / ...)
-I don't know / I've no idea / I wouldn't like to say (where it is).
-I haven't the faintest idea.
-Sorry, I can't tell you.
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