back and forth   (前后)来回地，往返
back up 支持；倒退
be bent on (upon) 一心想做(某事)
be bound to 注定；决心
be able to 能，会
be about to 正要，即将(做)
be absent from 不在；缺席
be absorbed in 专心致力于…
be composed of 由…组成
be concerned with 关于…，与…有关；
be determined to 坚定；坚决；决心
be fit for 适合
be inclined to 倾向于…；想要
be obliged to (do) 被迫，不得不
be obliged to sb 感谢
relate .to 与 联系，理解
be related to 与…相关的，有亲戚关系
be/get tired/sick of 对…失去兴趣；厌烦
be acquainted with 开始认识；开始了解
be addicted to doing 沉溺于；使吸毒成瘾
be alike/similar to与…相同，与…相似
be all ears全神贯注地倾听着
be attentive to 集中注意， 对…关怀
be aware of知道，意识到，认识到
be beneficial to 有利于，有益于
be well(better) off(更)富有
be/get used/accustomed to 习惯于
be born in/on/of  源于；出生于
be bound for准备到…去；开往
be busy with 忙于…
be capable of有做出(某事)倾向的
be/get caught in遭遇上，被困
be certain（sure）of 确信，肯定
be composed of/made up of 由…组成
be concerned with 关心，挂念；从事于
be considerate of 体谅…，替…着想
be disagreeable to 不合…意；对…发脾气
be eager for sth. 渴求某事物
be envious of  羡慕(或忌妒)
be equal to 等于，相当于
be essential to 对…不可缺少
be familiar to sb为…所熟悉
be familiar with对…熟悉
be fed up with 对…感到厌烦，吃得过饱
be fond of爱好
be friends with 与…交友(友好)
be full of 充满
be good at 善于，擅长于
be good to对…好；对…很慈善
be hard on sb.过于严厉对待某人
be ignorant of 对…无知(不了解)
be in fashion (人、物)合于时尚
be in for 参加(竞赛、考试等)
be in love with  跟…恋爱
be in the habit of有…习惯(或脾气)
be jealous of 嫉妒…
be known as以…知名；被认为是
be known for  因…而众所周知
be known to 为人所知
be located in位于…，坐落在…
be lost in 集中精力与，沉湎于
be loyal to忠于
be married to sb. 和…结婚
be noted as 以…而闻名
be occupied in  忙于…，正从事…
be on a diet 节食
be responsible to sb for sth 向…负责
be satisfied with 对…感到满意
be seated坐下，坐着；位于…
be short of缺乏，不足；达不到
be skilled in熟练于
be supposed to 被期望；应该
be sure of oneself 有自信心
be to blame（for）对…应负责任
be typical of 是…的典型特点
be up to从事，忙于,胜任,符合，轮..由
be up to you/standard/now/his job
be/get/become used to doing习惯于
be worth doing值得(做)
bear/keep in mind (of/that) 记住；牢记
before long不久以后
(to)begin with 首先，以…开始；
believe in相信，信仰，主张
belong to属于；附属
to the point中肯,贴切
best of all 最(好)，首先

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