改错（下列各句均有一处错误,请指出并改正）

题目

改错（下列各句均有一处错误,请指出并改正）
1.It's necessary of us to learn English well.
2.Rain make plants grow.
3.We can see hundreds of book in the library.
4.People are against to build the factorynear the school.
5.What happened with your uncle yesterday afternoon?

答案

1.of --for
It's+形容词+for sb.to do sth.是固定搭配
2.make --makes
要保持主谓的单复数一致
3.books--books
hundreds of ,那么书肯定也得用复数了阿
4.to build--buiding
5.with--to
to表示对象阿