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Oral Practice:
一. 现在完成时结构
构成：
助动词 have/ has + 动词的过去分词+...
1.我已经吃了早餐了。
I have already eaten breakfast.
2.他还没写作业。
He hasn't done homework yet.
(eat breakfast)
3.她打扫地板了吗？
Has she cleaned the floor yet?
(do homework)
(clean the floor)
4.你们在这里学习多久了？
( how long )
How long have you studied here ?
5.我们在这里学习已经两年了。
We have studied here for two years.
句型总结：
1. 肯定句：主语 + have/ has + 动词的过去分词+...
2. 否定句: 主语 + haven't/ hasn't + 动词的过去分词+...
3. 一般疑问句：Have/ Has +主语 + 动词的过去分词+...
肯定回答：Yes, 主语+have/ has.
否定回答：No, 主语+haven't / hasn't.
4. 特殊疑问句：特殊疑问词+have/ has +主语 + 动词的过去分词+...
二、现在完成时两种重要用法
He hasn't done the homework yet.
I have already eaten breakfast.
Has she cleaned the floor yet?
Yes,she has. /No, she hasn't.