1. be friends with对…...友好,与…...交上朋友
2. be absent from... 缺席,不在
3. by oneself 依靠自己
4. be accustomed to (=be in the habit of,be used to) 习惯于
5. be acquainted with (=to have knowledge of)了解,(=to have met socially) 熟悉
6. be ashamed of (=feel shame,guilt or sorrow because of sth done) 以…为羞耻
7. behind one’s back 背着某人(说坏话)
8. be based on/upon 基于
9. benefit (from) 受益,得到好处。
10. believe in (=have faith or trust in,consider sth/sb to be true) 相信,依赖,信仰
11. beat...at 在…运动项目上打赢
12. begin with 以…开始。to begin with (=first of all) 首先,第一(经常用于开始语)
13. by birth 在出生上,论出身,按血统 at birth 在出生时,give birth to 出生
14. be busy with sth 于某事
15. be busy doing sth 忙于做某事
16. but for (=without) 要不是。表示假设
17. buy sth for...money 用多少钱买
18. be capable of 能够,有能力
19. be capable of being + 过去分词:是能够被…...的
20. be cautious of 谨防
21. be certain of (=be sure of) 有把握,一定
22. by chance (= accidentally,by accident) 偶然
23. be common to sb 是与某人所共有的
24. by comparison 比较起来
25. be confident of 有信心