6. at(在……) Let's meet at the station.

　　She was at a conference.

　　The committee is to meet at the weekend. He joined up at eighteen.(join up 参军)

　　What are you laughing at? (laugh at 嘲笑)

　　My mother was surprised at the news.(be surprised at 吃惊) He is good at drawing.

7. before(在……之前)

　　Don't put the cart before the horse. 不要本末倒置。

　　Pride comes before a fall. 骄傲就会摔跤。 Before starting the work， we had a discussion.

　　Before long， the war broke out. (break out 爆发)

　　I bought the book the day before yesterday.

8. besides ( 除…之外还 ) There are six students in the classroom besides me.

　　Besides fun and good exercise， swimming is a very useful skill.

9. between(在……之间) Come between ten and eleven o'clock.

　　They don't know the difference between wheat and oats.

　　(among 用于三者或三者以上) What's the difference between them?

10. beyond(在……之外)

　　The lake is beyond that mountain. Don't go beyond the city boundary. (go beyond 超过)

　　It's expensive and beyond our reach.

　　The city is beyond recognition. (beyond recognition 面目全非)

　　The problem is too difficult. It's beyond me.

　　This is inevitable and beyond all doubts. 这是必然的，毫无疑义的。