be a while ----> wait
　　be about to // busy ----> no time
　　be about to lift the pan ---- > will soon be allowed
　　be astonished ---- > be surprised
　　be at ---- > attend
　　be booked up ---- > reserve
　　be bored ---- > have nothing better to do
　　back ---- > return
　　back up ---- > tie up
　　band try out ---- > want to play in the band
　　bargain ---- > purchase
　　be a little rusty ---- > not do sth. very much
　　be certainly/definitely news ---- > be surprised
　　be done with // be through with ---- > be finished with
　　be due Friday ---- > be paid by the end of the week
　　be excited // can hardly wait ---- > look forward to (doing) sth.
　　be exhausted ---- > stay at home and rest
　　be fed ---- > eat