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He’d prefer them not to...

He’d rather begin at once.

9.责备和抱怨Blame and complaint

a. He is to blame.

She blamed him for...

He shouldn’t have done it.

b. I’m sorry to have said that, but…

Why can’t you do something about it?

10.肯定和不肯定

Certainty and uncertainty

a. I’m sure (of that).

I’m sure (that).

b .I’m not sure that.

I’m not sure whether /if...

I doubt if...

c. Perhaps/ Maybe.

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