? wh-ever 在引导名词性从句时不能用no matter wh-来替换，但在引导状语从句时可以替换 Whatever happened, he would not mind. = No matter what happened, he……
2.【2016·北京】29. The most pleasant thing of the rainy season is ________ one can be entirely free from dust. A. what 【答案】B
B. that
C. whether
D. why
考点：考查表语从句 【名师点睛】
表语从句 Predictive Clauses (在be动词 后)
1. 从句的连接词可以是that, 也可以是wh-的特殊疑问词。 The fact is that she never liked him.
The question is whether the movie is worth seeing. The question is who can complete the difficult task. ? This/That/It is because …
I think it is because you are doing too much. ? The reason why…is that…
The reason why the play is successful is that it appeals to many different people. 2. 只能用whether 的情况
* 在表语从句、主语从句、同位语从句中 * 在介词后的宾语从句中
It all depends on whether they will support us. * 在不定式之前
He doesn’t know whether to stay or not. * 从句中有or not时
He doesn’t know whether he should stay or not.