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since five years ago .
思考一:1.现在完成时态的结构是什么?
2.如何变否定句 ?
3.如何变一般疑问句?
4.肯定回答和否定回答各是什么?
have/ has +动词的过去分词
在have﹨has后加not
把have﹨has提到句首
Yes, …..have﹨has .
No, ….. . haven’t﹨hasn’t.
思考二:在现在完成时态的句子中,for和since后加什么?
1. for+___________
=since + __________+ ago
2. since +___________
3. since + _________________
思考二:在现在完成时态的句子中,for和since后加什么?
1. for+ 一段时间
=since +一段时间 + ago
2. since + 时间点
3. since + 一般过去时态的句子
用for和since填空:
1.We haven’t seen each other ______ a long time.
2.His father has been in the factory ______ 10 years ago.
3.The film has been on ______ 20 minutes.
4.Mr Green has worked here ______ he came to China.
5. Great changes have taken place _____ last year.
6. It’s five years _______ we met last time
for
since
for