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Lucy went to bed after she finished her homework 改为同义句

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Lucy went to bed after she finished her homework 改为同义句
能否改为Lucy didn't go to bed before she finished her homework 为什么呢?
谢谢,很急
Lucy went to bed after she finished her homework 改为同义句
用until,
Lucy didn't go to bed until she finished her homework.直到Lucy做完作业了她才上床睡觉.
一般是考after和until的转换.
不懂追问.
再问: 请问用before可以吗
再答: 意义上也是对的。但同义句转换中常用的就是after和until的转换,这两种都强调某事干完后再干另一件事,所以更为接近。 以下摘自网上: 主句+after从句和not…until句型表示的含义也比较接近,两者之间也经常可以同义句转换。   请看下面的例句:   Zhang Hua left the classroom after he finished his homework. → Zhang Hua didn’t leave the classroom until he finished his homework.