3、that引导主语从句时,不能省略。
e.g. That he suddenly fell ill last week made us surprised.
(三)表语从句
1、表语从句在复合句中作表语,位于系动词之后。
e.g. The question was who could go there.
2、引导表语从句的连接词that有时可省去。
e.g. My idea is (that) we can get more comrades to help in the work.
(四)宾语从句
1、宾语从句在复合句中作宾语。引导宾语从句的连词that一般可省略。
e.g. I hope (that) everything is all right.
2、介词之后的宾语从句,不可用which或if连接,要分别用what或 whether。
e.g. Im interested in whether youve finished the work..
Im interested in what youve said.
3、whether与if都可以引导宾语从句,常可互换。但下面情况不能互换。
①宾语从句是否定句时,只用if,不用whether。
e.g. I wonder if it doesnt rain.
②用if 会引起误解,就要用whether。
e.g. Please let me know whether you want to go.(此句如果把whether改成if,容易当成条件句理解)
③宾语从句中的whether 与or not直接连用,就不能换成if;不直接连用,可换。
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