写出下列动词的第三人称单数,现在分词和过去式

1.become becomes becoming became
2.begin begins beginning began
3.give gives giving gave
4.think thinks thinking thought
5.teach teaches teaching taught
6.catch catches catching caught
7.take takes taking took
8.know knows knowing knew
9.tell tells telling told
10.fall falls talling fell
11.fly flies flying flew
12.cost costs costing cost
13.keep keeps keeping kept
14.hurt hurts hurting hurt
15.write writes writing wrote
16.stop stops stopping stopped
17.study studies studying studied
18.chat chats chatting chatted