He did nothing but do homework at home last night.为什么是do

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• He did nothing but do homework at home last night.为什么是do
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• He spent two hours ()(do)his homework.答案是doing. 而我写了did.为什么不是did呢?不是已经做了作业再说的吗,那就用过去式啊.我想不通诶,Help me!
• I slept well last night.怎么改成疑问句这个句子中是第一人称,I am 应该将am提前,改为Are you sletp well last night?但是这样改是错的,正确的改法是：Did you sleep well last night?我不知道为什么要这样改,有 am ,is ,are 的改疑问句时不是直接提前就行了吗?这个题中这不是有am提前不就行了吗 ,怎么用上DO了?明白的给我讲一下吧,
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• 将下列句子改成祈使句并将其改为祈使句的否定形式He is listening to music.He is cleaning the classroom.She can wash clothes for her mother.You should stay at home today.Tom can answer my questions.You would like to read the new words fous us.You did your homework carefully last week.You should do it again.要快,求求你们了,拜托了,今天完成,谢谢!
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• you Did play last weekend basketball?He his did homework night last.连词成句