牛津译林版8上unit 3 grammar (共27张PPT)

Unit3 Grammar Simple past tense and present perfect tense To review the uses of simple past tense To review the uses of present perfect tense To learn the differences between the simple past tense and present perfect tense Do you know the musical? What is it? Have you ever heard of the song? When did you first heard of it? Most of us heard of the song last week. Yes, we have heard of the song. Have you ever heard of the song? When did you first heard of it? Most of us heard of the song last week. Yes, we have heard of the song. What tense are the two sentences? present perfect tense 现在完成时 simple past tense 一般过去时 revision of the present perfect tense 1 定义： 2 结构： 3 标志词： 动作发生在过去，对现在有影响。 动作发生在过去，并有可能继续持续下去。 have/has done already, yet, ever, never, just, recently, before so far, over the years, up to now,many times for， since revision of the simple past tense 1 定义： 2 结构： 3 标志词： 一般过去时表示过去某个时间里发生的动作或状态，与现在的情况无关。 did yesterday， the day before yesterday last week ,last year， days