by the time i got there ,the bus had left.为什么后半句要用现在完成时?

by the time I got outside,与when I got outside 的 区别 By the time I got outside,the bus had already leftBy the time在By the time I got outside,做的是什么成分 I got back to Beijing by plane (on the 7th) 对括号内提问 i o____ and by the time i got up my brother had gotten in the The film （）（begin）by the time I got to the cinema 动词填空 by the time i got home yesterday,my mother____(cook)the dinner for the family by the time i got to the bus stop,the bus_ already_（leave） By the time I got to the bus stop,the bus___a ready ____ (leave) By the time I got to the theatre ,the play _(bagin ) 急 He left at ten.（by the time I got there作时间状语改写句子） He ____ ____ by the time I got there by the time she got to by the time she got up by the time i got there ,the bus had left.为什么后半句要用现在完成时? By the time I got outside,the bus had already left 这是什么时态啊 by the time I got outside, the bus had already left是什么句是不是过去式 outside,bus,the,already,time,I,left,the,by,got,had By the time i got up ,my father had gotten in the bathroom是什么意思? By the time I got to school,the second class___By the time I got to school,the second class_______(be)over