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外研2003课标版《Grammar》PPT课件优质课下载
A
B
有两个动作都发生在过去，先后发生，
先发生的用过去完成时，
后发生的用一般过去时。
过去的过去
Now
Past
Future
A
B
现在完成时：have/has+done
过去完成时： had +done
had not +done
had been done
After they had become stars in their own country, the Beatles toured the United States.
2.After they had got everything ready, they began to do the experiment.
3. Before they visited India, they had recorded seven albums.
Read the sentences together.
4.Before he came to our school, he had taught English for several years.
5.By the late 1960s,their music had changed completely.
6.By the time they stopped working together, they had sold more albums than any other band in history.
1.after引导的时间状语从句（过去完成时）+主句（一般过去时） 2.before引导的时间状语从句（一般过去时）+主句（过去完成时） 3.by引导的表示过去的时间状语（或状语从句）+句子谓语部分（过去完成时）
Summary
Exercises