题目内容：

写出下列动词的第三人称单数,现在分词和过去式
1.become
2.begin
3.give
4.think
5.teach
6.catch
7.take
8.know
9.tell
10.fall
11.fly
12.cost
13.keep
14.hurt
15.write
16.stop
17.study
18.chat

优质解答

1.become becomes becoming became2.begin begins beginning began3.give gives giving gave 4.think thinks thinking thought5.teach teaches teaching taught 6.catch catches catching caught7.take takes taking...