请教英语大师,为什么句子The man did not wake up until the bed had struck the bed
问题描述：
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
答
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...