⑷后面跟or not时
⑸后面直接跟动词不定式时
It all depends on they will support us.
He doesnt know to stay or not.
Whether与 if均可使用的情况
⑴引导宾语从句 ⑵在be+adj.之后 He was not sure whether/if it is right or not.
2 、 what 与 that 的区别
⑴that引导名词性从句,不在从句中充当任何成分,只起连接作用;what是连接代词,在从句中充当成分作主语、宾语或表语。除表明具体的内容外,还表的时间、地点、人、速度等。
① made the school proud was more than 90%of the students had been admitted to key universities.
A. What; because B. What. that C. That; what D. That; because
②----I think its going to be a big problem.
----Yes, it could be.
----I wonder we can do about it.
A. if B. how C. what D. that
A modern city has been set up in was a wasteland ten years ago.
After seemed a long time, he managed to work out this problem.
⑵介词后的宾语从句常用what引导,不用that引导。但在介词besides,except,in后可用that引导宾语从句。由it做形式宾语时,that引导的宾语从句中,that不可省略。
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