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when,though等连词后可以跟分词吗?

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when,though等连词后可以跟分词吗?
when和though等作为连词应该连接句子,即有谓语动词,如果省略,必须谓语动词的一部分是be动词的某种形式,比如when (I was) reading my book,I heard a big noise outside the window.或 Though (I was) fascinated with the beauty of nature,I had to leave at that time.但是我的确经常看到诸如when finishing my homework,I went to bed.这类既不符合省略规则,又加连词加的不伦不类的句子,这个到底是误用还是有某种我不知道的语法规则呢?
怎么就没人懂我的意思呢?when和though作为连词应该是连接句子的,怎么可以和非谓语连用呢?但是的确经常看到这类句子
when,though等连词后可以跟分词吗?
你说的用法都是对的,在语法上,这叫状语从句的省略.在状语从句中,当主句的主语和从句的主语一致时,常省略从句中的主语和be动词.这个考点在高考中常考.例如:
While ________ ,someone knocked at the door.
A.watching TV
B.was watcing TV
C.i was watching TV
D.watched
这个题应该选C
The research is so designed that once ________ nothing can be done to change it.
A.begin B.began C.begun D.beginning
答案C