1.catching 现在进行时,前面有系动词be
2.at at school 在学校,习惯用语
3.sleeping 动名词做后置定语,可改成which sleeps...
4.likes 习惯用语like donging...喜欢做某事
5.I don't like climbing hills on Sunday.
6.There aren't any (或者 There are no) insects in the park.
7.a lot of 改成 a lot
8.how are 改成 how do