请教英语大师,为什么句子The man did not wake up until the bed had struck the bed和句子After he had put it on the floor,he went to sleep again.要用过去完成时呢?全篇都是用个过去时,为什么这两句不能用过去时?菜

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请教英语大师,为什么句子The man did not wake up until the bed had struck the bed和句子After he had put it on the floor,he went to sleep again.要用过去完成时呢?全篇都是用个过去时,为什么这两句不能用过去时?菜
请教英语大师,为什么句子The man did not wake up until the bed had struck the bed
和句子After he had put it on the floor,he went to sleep again.要用过去完成时呢?全篇都是用个过去时,为什么这两句不能用过去时?菜鸟真心求解

请教英语大师,为什么句子The man did not wake up until the bed had struck the bed和句子After he had put it on the floor,he went to sleep again.要用过去完成时呢?全篇都是用个过去时,为什么这两句不能用过去时?菜
he went to sleep 是一个过去时,在这个过去时之前发生的动作就要用过去完成时,表明他是先把东西放在了地板上,之后才去睡觉的.又如:
After he had finished his homework,he was allowed to go and play football.在他完成作业之后,他才被允许出去踢球.

这句应该是有明显的先后顺序,所以用了完成时

这两件事都是在过去发生的,但前半句发生的事在后半句之前,属于过去已经完成的事所以用过去完成时。

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