be really pretty crowded // stand in the aisles ----> be very well attended
　　be short of one course ----> need to take another course
　　be sold out ---- > not ... any more
　　be still on for next week ---- > continue the following week
　　be still working ---- > keep one's job
　　be supposed to be easy // not ... do well in // isn't easy ---- > difficult
　　be tested on it ---- > read the page carefully
　　be over ---- > change
　　be over at one // after that ---- > in the afternoon
　　be pretty happy with ---- > seem to like
　　be pretty rusty ---- > lose some of one's skill
　　be really dedicated ---- > do one's best
　　be really onto sth. ---- > Sth. seems promising.
　　be the obvious choice ---- > would get the job
　　be through in next no time ---- > be nearly finished
　　be through it in two days ---- > be a fast reader
　　be tied up in // have one's hands full // have a tight schedule ---- > too busy
　　be up to // over one's head ---- > not succeed