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为什么when后面引导的从句,没主语时,里面的动词一定是非谓语?
来来来,跟我背一个口诀:“主主相同,主谓用be,从主可省”。解释:从句和主句的主语相同,主句的谓语动词是be动词,从句的主语和谓语可省。例句:1. She was smiling when walking down the street.
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