高三英语总复习语法---名词性从句课件
whether 与 if 均为 “是否” 的意思。但在下列情况下,whether 不能被 if 所取代:
1.whether 引导主语从句(包括从句在句首的位置)应当用whether,不用if,如:
Whether it is true remains a problem.
Whether he will come, I am not sure.
2. 引导表语从句用whether,不用if,如:
The question is whether you should accept it.
3. whether可以引导从句作介词的宾语,而if 则不能,如:
I’m not interested in whether they’ll go or not.
It depends on whether we have got enough money.
4. whether可以直接跟动词不定式连用,而if 则不能,如:
I didn’t know whether to laugh or to cry.
She hasn’t decided whether to go or not.
5.引导同位语从句用whether,不用if,如:
The question whether he’ll attend the meeting is essential.
大部分连接词引导的主语从句都可置于句末,用it充当形式主语。
It is not important who will go.
1)由从属连词that引导的从句叫做名词性that-从句。that只起连接主句和从句的作用,在从句中不担任任何成分,本身也没有词义。
名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语,例如:
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