- ask for a ride要求搭便车
- break up into分成几个部分;
- be up in the air在空中
- be nostalgic for怀念过去
- be careful of小心，注意;
- be busy doing忙于（做）...;
- be mad about疯狂于;
- be indispensable tov.必需;
- be in the way妨碍;挡路;绊手绊脚;碍手;
- be favourable to赞成…;
- be expert at做个专家
- be equal tov.胜任，相等，合适;媲;匹;仵;
- be empty of缺少;
- be sold out售完;
- be set on something被设定在某物上
- be opposed to反对…;背道而驰;
- be on guard防范；惕励；惕历;
- be observed观察，留心;
- check up on查清;
- for what it is worth（真伪未明但）不妨暂时这样说[听，看];
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