摘要: 瞬间动词用于完成时态不能与for + 一段时间 或since + 时间连用. 常见瞬间动词有:arrive, reach, start, begin, leave, close, open, finish, join, buy, die, find, see, go, 但可以与否定式连用 例:He has joined the army for three years. 误 He joined the army three years ago. 正 He hasn’t returned home for 3 years. 3) 完成进行时态与进行时态的区别 完成进行时态表示动作从过去一直持续到现在,而进行时时态只指目前正在发生的动作. 例:He has been reading that magazine since last night. He is reading a magazine. 4) 在状语从句中代替将来时态. 例:Don’t get off the bus until it has stopped. I will give my opinion when I have read the book through. We will start at eight if it has stopped rained by then.

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