Question

求问连词后直接加非谓语的用法！救救孩子吧 并列连词和从属连词都可以直接加非谓语吗

Answer 1

回答：1.并列连词是连接两个相等成分(主语、谓语、宾语、宾补、表语、定语等)，包括词、短语、句子。因此并列连词是可以连接两个非谓语形式(包括动名词、分词和不定式)的。例如：
Tom and Peter will go and see their teacher in hospital.
Our jobs are sweeping / to sweep the classroom and cleaning / to clean the windows.
The film is interesting and moving.
He said that he was born of a poor family and that his mother died at his age of five.
2. 从属连词引导状语从句(不包括原因状语从句)时，若主句的主语和从句的主语一致、或从句的主语是it、或从句谓语有be动词的话，则可以省略主语和be动词。例如：
Don't speak until（you are) spoken to. While (he was ) walking down the street, he noticed a car broken down.
If (it is) necessary, we will come and help you.
When (he was ) in college, he often went there.
She looked at me as if ( she was ) to say something.
注意事项：因为before和after除了作从属连词之外还可以作介词，故这两个词后面要么是从句，要么是动名词短语。试比较：
After he finished his homework / After finishing his homework, he went home.
此外，原因状语从句不能采用这种省略句，但可以直接用分词短语作状语。例如：
Being ill(= As he was ill), he didn't come.

Answer 2

从属连词 + 非谓语动词 = 从属连词+ 状语从句
它们之间在一定的条件下是可以互换的。如：
After having finished the homework, he went to bed.
= After he had finished the homework, he went to bed.
但是并列连词后接非谓语动词不是一定的，除非是接两个并列的非谓语动词。如：
He likes watching TV and playing games. 他喜欢看电视和玩游戏。
若还有不懂的，欢迎追问，可以拿具体的句子或题出来问。

Answer 3

我觉得你说的可能是省略句用法，比如：
He made a mistake
while doing the experiment.他的原句应该是He made a mistake while he was doing
the experiment.由于前后主语一致，可以省略掉从句的主语和
be动词。