Unit 2 Amazing people
Period 4 Grammar
一．【设计思想】
以观察—发现—讨论—归纳—运用为主要教学模式，充分利用本单元语言素材，通过多种图示和语法规则的呈现，让学生比较全面系统地掌握过去完成时的用法、一般过去时与过去完成时的用法区及现在完成时与过去完成时的用法区别。
二．【教学目标】
Master the usage of past perfect tense.
三．【教学重难点】
The main usage of past perfect tense.
The differences between present perfect and past perfect.
【课堂导入】
Step1：观察与思考（请赏析课本中含有“过去完成时”的句子并口头将它们翻译成中文）1. (L7P42) By the 1920s, he had become an explorer, searching for the tombs of the Egyptian kings.
2. (L17P42) The tomb contained more treasure than any of us had ever seen before, as well as the mummy of the king.
3. (L23P42) Upon their entering the tomb, Carter’s lucky pet bird, which he had left in Cairo, was swallowed by a snake.
4. (P48) Carter said that they had hidden the entrance to the tomb.
5. (P48) I had done my homework this morning before I went to the museum.
【课堂教与学】
Step2：请阅读教材48页有关内容，然后总结过去完成时构成形式和主要用法
Step3： Complete Part A(on Page49)
Step4： Complete Part B(on Page50)
Step4： Present perfect or past perfect?
1. The present perfect tense is used when we are talking about a past event which relates to the present time.
e.g. Howard Carter is one of the most famous explorers the world has ever known.
2. The past perfect tense is used when we are discussing the past and want to talk about an even earlier event.
e.g. Not long after the tomb had been opened, people in Carter's team began to fall ill and die strangely.
【课堂巩固】
请用适当的时态完成下列句子
