名词性从句的that一定做成分吗?一定可以省略吗?定语从句的that一定做成分吗?一定可以省略吗?

Question

名词性从句的that一定做成分吗?一定可以省略吗?
定语从句的that一定做成分吗?一定可以省略吗?

Answer 1

名词性从句的that一定做成分吗?一定可以省略吗?
名词从句中的that是不充当成分的,它是个连词,只起连接功能.
宾语从句中的that一般可以省略的.
但如果宾语从句很长,或者并列连词后的that一般不省略的.
主语从句、同位语从句或表语从句一般是不能省略的.
例：
He said (that) he would come the next day.
He said (that) he would come the next day and that his father also would come.（后句的that不能省,因为也是他说的）
定语从句的that一定做成分吗?一定可以省略吗?
因为这个that是个关系代词,所以是充当成分的：在定语从句中常做主语、宾语.做宾语时可省略.
如：
The book (that) he lent me is very interesting.
The book that was bought yesterday is not interesting.(不能省略）