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Review
1. How long has Mr Chen lived in Sunshine Town?
2. What has the government done to part of the town centre?
3. Why does Mr Chen think it is impossible to see his old
friends as often as before?
He has lived there since he was born.
The government has turned part of the town centre into a new park.
Because most of his old friends have moved away.
The Present Perfect Tense (现在完成时态)
基本结构:
助动词have/has +动词的过去分词
Present perfect tense
1. I have lived here since I was born.
我自从出生就一直居住在这里。
过去发生的动作一直延续到现在，有可能继续延续下去。
2. Eddie has eaten my food.
埃迪吃了我的食物。
过去发生的动作，对现在造成影响。
3.I have already read this book many times.
我已经看过这本书很多次了。
某个动作迄今为止发生过多少次。
现在完成时定义
现在完成时定义三要素：
1.一个动作开始于过去，并持续到现在(也许还将
持续下去)。
2.一件发生在过去的事情，对现在产生影响。
3.一个动作到现在为止已经发生多次。
观察与思考
结论：现在完成时的肯定句结构为
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