常用介词用法：

1. across(穿过) My mother lives across the street.

　　I came across him yesterday. ( come across偶然遇到 )

　　The post office is just across the street.

2. after(在……之后)

　　The girl is named after her mother.

　　(name after 以……命名)

　　Rewrite the sentences after the model. (模仿，仿照)

3. against(反对) What you are doing is against the rule.

　　We are against the proposal. (be against 反对)

　　Nobody has got anything against you.

4. along(沿着) They walked along Nanjing Road.

　　There is a cinema along the street. I'm getting along well with my classmates.

5. around(围绕) We all drew up closely around him.

　　The guide showed us around the city.

　　(show sb. around 领某人参观)