You can be sure [certain">certain] of his agreeing. 你可以放心他会同意。
比较同义句:
He is certain">certain [sure] of winning.
=He is sure [certain">certain] that he will win. 他自信会赢。
(3)
后接 that / whether / if 从句。如:
I am sure [certain">certain] that he is honest. 我肯定他是诚实的。
I’m sure [certain">certain] that it’s not your fault. 我敢肯定这不是你的错。
Are you certain">certain [sure] that this is the right road? 你肯定这条路对吗?
注:当be sure [certain">certain]为肯定式或疑问式时,后接that从句;当be sure [certain">certain]为否定式时,后接whether [if]从句。如:
I’m not sure [certain">certain] whether he still works there. 我不能肯定他是否还在那里工作。
I wasn’t sure [certain">certain] whether he would agree. 我不太肯定他是否会同意。
He wasn’t sure [certain">certain] whether he would be able to get back in time. 他不能肯定他是否能准时回来。
(4)
后接其他从句。如:
I’m not sure [certain">certain] where she lives. 我不能肯定她住在哪里。
I’m not certain">certain [sure] who wrote it. 我不太清楚这是谁写的。
二、只能用
certain
的情形
以下情况通常只用certain,而不用sure:
1.
当句中用了形式主语或形式宾语 it 时。如:
It’s certain that he’ll come tomorrow. 他明天肯定会来。
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