名词性从句
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主语从句
例如:It + be + 形容词/名词/动词过去分词 + that 从句
It is strangethat he knows nothing about it.
从句:He knows nothing about it.
主句:It is strange something (= He knows nothing about it).
连接词在从句中是否充当成分:否连接词是否可省:否
宾语从句
例如:that 引导的宾语从句
I think that English is important.
从句:English is important.
主句:I think something (= English is important).
连接词在从句中是否充当成分:否连接词是否可省:是
表语从句
用法和结构同宾语从句,区别在于:系动词后面所接的从句为表语从句,而及物动词后面所接的从句为宾语从句。
例如:- that 引导的表语从句
The truth is that English is important.
从句:English is important.
主句:The truth is something (= that English is important).