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1.He seemed to have known it.(改成同义句)2.She didn't know how sh

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1.He seemed to have known it.(改成同义句)2.She didn't know how she did next.(改成简单句)3.He is ...
1.He seemed to have known it.(改成同义句)2.She didn't know how she did next.(改成简单句)3.He is unhappy, ?
It seemed that he had known it .
she didn't know how to do next .
he is unhappy,isn't he?因为unhappy是由前缀un加上词根词,这样的词在句子中变反意问句是句子仍为肯定的,所以后面用否定式isn't.