Question

一道英语选择题，求解：

It isn't quite ____ ____ he will be present at the meeting.
A. sure, whether B. sure , if C. certain, whether D, certain , that
选哪个，sure和certain 有什么区别

Answer 1

我的理解：人作主语，意为“某人肯定 .....”， 既可以用sure又可以用certain。但如果主语是it（即it做形式主语），则此处不能使用sure，只能用certain。
--I'm not quite sure whther he will come.
--It is not certain whether he will come. = Whether he will come is not certain.

总结：sure指的是人主观性的、直觉性的推断。certain就没这个意思。

请翻翻例句多的词典，看看certain的例句就可以明白了。

Answer 2

答案选 C
It's quite certain that ... 非常确定/肯定...
而sure通常用人作主语 sb be sure that
It isn't quite certain whether he will be present at the meeting.
他是否会出席会议还不是很确定。

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Answer 3

C
It isn't quite certain whether he will be present at the meeting.
他是否会出席会议还不是很确定。