人教版九年级英语第十二单元知识点总结 Unit 12 Life is full of the unexpected
一.单词 unexpected by the time backpack oversleep give sb a lift block in line with worker stare disbelief above burn burning alive airplane till west cream workday pie show up bean market by the end of fool costume embarrassed costume party announce spaghetti hoax sell out discovery lady cancel officer believable disappear embarrassing 本单元语法:过去完成时
过去完成时表示在过去某一时间点以前即“过去的过去”已经发生的动作
Black told me that he had seen the movie three times
⑴ 过去完成时表示在过去某一时间或动作之前已经发生或完成的动作
它表示动作发生的时间是“过去的过去”
⑵ 过去完成时的结构是:肯定由“助动词had(用于各种人称和数) + 过去分词”构成 否定式:had not + 过去分词 缩写形式:hadn’t ⑶ 过去完成时的时间状语: ① 表示过去某一时间可用by, before 等构成的短语
We had finished our homework before 10 o’clock
② 可能通过when, before 等引导的从句表示
When I got there, the train had left
③ 过去某一时间通过上下文来