(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. I'm interested in whether you've finished the work..
I'm interested in what you've 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 doesn't 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。
e.g. I don't know whether or not the report is true.
I don't know whether/ if the report is true or not.
④介词后的宾语从句要用whether引导。whether 可与不定式连用。whether也可引导主语从句、表语从句、同位语从句,还可引导让步状语从句,以上均不能换成if。但引导条件从句时,只能用if,而不能用whether。
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