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简介：
1.一般现在时do/does
2.一般过去时did
3.一般将来时will do
4.现在进行时an/is/are doing
5.过去进行时was/were doing
6.将来进行时will be doing
7.现在完成时have/has done
8.过去完成时had done
9.将来完成时will have done
10.过去将来时would do
11.过去将来进行时would be doing
12.过去将来完成时would have done
13.现在完成进行时have/has been doing
14.过去完成进行时had been doing
15.将来完成进行时will have been doing
16.过去将来完成进行时would have been doing
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