从句中主语和主句一样时,可以省略主语,时间状语,条件状语,和系动词(非主语)
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这个说法仅限于某种句式或某种情况。并非所有情况都可省略。
在时间状语和条件状语从句中,其主语跟主句的主语相同,而且还有be动词时,可把这个代词以及be动词一起省略。如:
Tom won't come to your party unless (he is) invited.
Once (it is) heated, water will become vapour.
Mary often helped her classmates when (she was ) free.
Tom likes to listen to music while (he is) reading.
这个be动词可以是系动词,也可以是构成被动语态的be,和进行时的be。
你的句子是:while walking the dog you were careless. = While (you were) walking
我的回答满意吗?
不是句子啊,只是通过这个while walking the dog you werecaless........这句话总结的!只是我不明白系动词(非主语),是什么意思?
追答这样啊,懂了!就是可以省略非主句主语的系动词!就是说从句里的主语和系动词同时被省去哦~
比如当过马路的时候,你应该小心。
when you are crossing the road, you should be careful.
when crossing the road, you should be careful.