they left the house an hour______(ago before)

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ago
.ago表示“从现在起的若干时间以前”,意思是“距今……以前”,需和过去时或过去进行时连用.before泛指“从过去起的若干时间以前”,意思是 “距过去某时……以前”“与其……（毋宁）”,常和完成时连用,尤其在间接引语中,如：I visited him three days ago,but he had gone to Shanghai a week before．我三天前去访问他,但他已与那时的一周前到上海去了.
再问：

再答：你想问哪一题？
再问：空着的
再问：顺便帮忙检查吧，谢谢
再答：你想问哪一题
再问：所以空着的，谢谢
再答： danger，lose，died，advice，our ，hardwoking，to teach，in，take，race，something
再问：谢谢了!
再问：第二题有些没拍出来，你确定吗?
再答： in danger 是固定搭配，童鞋
再问：哦，谢谢了!

they left the house an hour______(ago before) They left Changsha an hour ago. They left an hour ago变成现在完成时同义句转换 They built the house 300 years ago转换为It's an old house They left here half an hour ago.(同意句转换) i remembered ______ the door before i left the house they fixed up the house before they moved in翻译 They bought the two house tenth years ago.这个句子 This is the house they lived a long time ago They bought the house ten years ago.(改成被动) Mrs Black left the house (ten minutes ago.) 括号处提问吧 came before the house