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1、Unit5 Revealing Nature Using Language：Grammar Past perfect 教学设计教学目标By the end of this lesson，students are able to：1. Know the structure of the past perfect tense;2. Know the usage of this tense；3. Know how to solve the problems of past perfect.教学重难点Important point：the structure and the usage of past
2、 perfect.Difficult point：how to use this tense to solve the problems.教学过程Step 1.Lead in:a guessing gameAsk two students to compete with each other,pick out the sentences which are used past perfect. Then ask students to conclude the structure of past perfect.肯定式：had done否定式：had not doneStep 2.the us
3、age of the tenseGive students two sentences of each usage,then students get the points together.Before we got to the train station, the train had already left.我们到达火车站之前，火车就已经离开了。Before I could say “thank you”, he had run away. 我还没来得及说谢谢，他就跑开了。Conclusion:表示在过去的某一时间或某一动作之前完成的动作或存在的状态。 By the end of la
4、st term, we had learnt 2,000 English words. 到上学期期末为止，我们已经学习了2,000个英语单词了。They had lived there for ten years by then. 到那时为止，他们已经在那里住了10年了。Conclusion: 表示从过去某一时间开始，一直延续到过去的另一个时间的动作，常用的时间状语有be then, by the end of, by the time.Give students a timeline of past perfect to help understand the tense.Step3. so
5、me fixed sentences pattern of this tense在“hardly.when/ no sooner.than/ scarcely.when”句型中,主句用过去完成时，从句用一般过去时。Eg. I had no sooner reached home than it began to rain. No sooner had I reached home than it began to rain. 我刚到家就开始下雨了。(注意:部分倒装）It was一段时间since从句(从句用过去完成时）Eg.It was at least three months since
6、I had left Beijing.我离开北京至少有3个月了。It was the first/second/.time(that)从句(从句用过去完成时)Eg.It was the first time that I had chatted online in English. 那是我第一次用英语在网上聊天。Step4：give students a learning tip正确运用过去完成时的关键是要正确理解“过去的过去”。“过去的过去”是一个相对的时间，即它是相对于一个过去的时间而言的。这种相对的“过去的过去”有时通过时间状语体现出来，有时则可能是通过上下文来体现。结合题干中的语境来判
7、断两个过去的动作发生的先后顺序，较早发生的那个动作用过去完成时。Step5：do some exercise1.He _(learn) 3000 words before he went to England.2.The old man told us that he_ ( travel ) to many places.3.It was the third time that he _ (see) such a large animal.4. By the time he got to the airport,the plane _(take off)5.Before Mary did her homework , she_ (wash) the dishes.Step4.SummaryStep4 Homework完成配套练习学科网（北京）股份有限公司