初中三年级英语下册unit12第一课时课件

1、Unit 12 Life is full of the unexpected.Period 1The Past Perfect Tense过去完成时过去完成时的构成助动词 had (用于各种人称和数) + 过去分词When I got to school, the bell had rung.2. 过去完成时的用法:主要是表示在过去某个时间,或是动作之前已经发生或完成的动作.也就是过去的过去.The Past Perfect Tense过去完成时3. 常用的几种方式:用介词by, before 等构成的时间短语.用连词when, before, after或者短语by the time引导的时

2、间状语从句.We had learnt 20 English songs by the end of last month.The plane had taken off when I reached the airport.By the time I got up , my brother had left home.I got homenow9:00pm8:00pmMy little brother went to bedBy the time I got home, my little brother had gone to bedBy the time I got outside, t

3、he bus had already left.By the time I got outside, the bus had already left.我出去的时候,公共汽车已经开走了.by the time 意思是 “到的时候”,相当于 when , 后接过去时的句子时, 主句的谓语动词用过去完成时态.构成：助动词had + 动词的过去分词用法：1. 过去完成时动词表示过去某一时间或某一动作之前完成的动作或状态。强调过去某一动作发生在另一动作之前时。1.他说他以前见过你。He said that he _ (see) you before.had seen2. 到六点钟为止他们已经工作八小时

4、了。By six oclock they _(work) for eight hours.had worked2. 过去完成时可以表示过去某一时刻之前发生的动作或呈现的状态，这一动作一直持续 或将继续下去。By six oclock they _ (work)for eight hours. When I came to GZ , he _(be) there for a long time.用法：1. 到了六点钟为止，他们已经工作了八小时了。2. 我到广州时，他在那里很长时间了。had workedhad been3.到上个月中旬我们在北京住了有五年时间了。By the middle of

5、last month we _(live) in Beijing for five years.had lived1. 到昨晚上，他已写完那封信。By yesterday evening he _ (write) that letter.2. 他说他以前见过你。He said that he _(see) you before.3. 当我进来时，他已做完了作业。When I came in he _(finish) his homework.过去完成时与 by then(截止到那时); by 9 oclock(直到九点钟) by the end of (在结束/末之前); by the tim

6、e(在时之前); up till then (直到那时); up until last night(直到昨晚）等连用，表示过去的过去。had writtenhad seenhad finished3. 过去完成时和 already, just, ever, yet 等连用表示过去的过去。用法：例如：1. 他告诉我说他们队已经赢了。He told me that his team _ already _ (win).hadwon2. 她说她仍没去过长城。She said that she _(not go to) the Great Wall yet.hadnt been to用法：过去完成时与

7、when, before, as soon as, till/ until 等引导时间状语的从句连用，强调动作发生的时间前后。例如：1. 她到家之前她的孩子已经睡着了。When she got home her children _(sleep).had slept2. 在他们到达之前电影已经开始了。Before they arrived here the film _ already _ (start).hadstartedLast night, as soon as I _(finish) my work I went to sleep.3. 我完成作业了就去睡觉了。had finished1. After he _ (finish) his work he went out.had finished2. The children ran away after they _ (break) the window.had broken3. I went to Toms house but he _ (go) out.had goneExercises:4. Annie told me that his father _ ( go ) to Paris and he _ ( come )