be busy忙着
be busy about忙于...
be careful t0务必注意
be certain to一定，必然
be confident in对有信心
be clever at擅长于
be composed of由组成
be connected with与有关
be covered with被覆盖
be curious t0很想
be derived from由得到
be capable of能够
be characterized by以为特征
be combined with与结合
be concerned about关心，挂念
be coupled with与...配合
be crowded with挤满，拥塞
be dependent on/upon取决于，依赖
be determined to决心
be different from与不同
be divided into被分成
be eager to急于要
be equal to等于
be fed up厌烦
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