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人教2003课标版《Learning about Language》精品PPT课件优质课下载
contrary to the fact
1. If it disappeared now, people would/might be
2. If it were...now, we should /could enjoy...
contrary to the present
Finding the rules
Contrary to
the present
If clause
（If 从句）
Main clause
(主句)
The verb forms
(谓语动词形式)
______/_____________/_______
+___
_____/_____
were
did
would
should
could
might
do
Stop 2 Du Fu Thatched Cottage
If it hadn't been built then, Du mightn't have written so many poems there.