learning how to repair motors takes a long time
learning how to repair motors takes a long time,__1,don't they 2,does it 3,do they 4,doesn't it 四个中选哪个呢?为什么?谢谢。
4 是对的 这句的主语是learning how to repair motors 是分词短语 是单数的 所以用IT 这句是肯定句 所以用DOESN‘T
4. 动词的现在分词短语做主语。可改成形式主语it+v.+不定式 It takes a long time to learn how to repair motors, doesn't it?
答:选B 反意疑问句的附加问句中的助动词(连系动词或者情态动词)应该和主句一致。主句中如有情态动词或Be动词,反意疑问句中相应也应该用情态动词或Be动词。主句中若是...详情>>
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问:working hard vs. hard working
答:there are no defferent.详情>>