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简介:
1.am,is--was是
2.are–were 是
3.do/does–did做,干
4.can-could能
5.will–would将要
6.shall–should应该
7.catch–caught捉,抓,追
8.teach-taught教
9.think–thought想,认为
10.buy–bought买
11.bring-brought带来
12.drink-drank喝
13.swim-swam游泳
14.begin-began开始
15.sit-sat坐