1.she is (thirteen years old)对括号部分提问
2.I's keen on sports.(同义句转换)
3.He likes sports.He'shealthy.（用so合并为一句）
4.She likes playing chess(改为否定句)
5.I can swim .I can 't skate well.(用but合并为一句)
6.He came to shenzhen (by plane).(对括号部分提问)
7.All the boys were very excited .(改为一般疑问句，并做肯定和否定回答)
8.We sang some English songs at the party .(改为一般疑问句，并做肯定和否定回答)
9.We (nivsited the zoo) last weekend .对括号部分提问
10.I went to the movies last saturday.(改为否定句)
11.I‘m going to prepare breakfast .(改为一般疑问句，并做肯定和否定回答)
12.He is going to see a film..(改为否定句
13.I', going to (play thennis) tomorrow.对括号部分提问
14.He will finish his homework (at 9 o'clock)对括号部分提问
15.the children had fun in the swimming pool.同义句转换
16.I am seldom late for school.用he 改写
17.They heard from her this morning .改为一般疑问句，并做肯定和否定回答)
18.they will go on trips to Hainan next month.改为一般疑问句，并做肯定和否定回答)
会的就打上号数写下来，全部去的加20分。