by the time he retires ,my father ——for almost forty years .为什么不是has worked 而是will have worked

动词填空：She ( ) by the time he got back.(go ) By the time that we got there,he was out. 翻译By the time he comes,I'll have left.( By the time he came,I had left.) by the time he returns,the project probably ____ahead of time by the time ,by then She had gone by the time he got back 其中的by the time 能用when 或while替换吗 By the time by the time by the time you came back,we (complete)the work by the time he comes back,we (complete)the workby the time you came back，we (complete)the workby the time he comes back,(complete)the work 题目是这样的：by the time he was ten ,he ( ) very well . Just then,he heard short,quick steps closely behind him.By the time he reache By the time he got to the airport,the plane had taken off.改为一般疑问句 By the time he reached the other side of the bridge 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 at the time 可以做连词用吗he became a doctor （by） the time he is 31.by那个空可以填at吗 Mr.Jackson is quite satisfied with the job now for which he is paid______.A.by the time B.by times C.by the hour D.by hours by the time he finishes the part-time job,he will have gain much work experienceby the time he finishes the part-time job,he ____much work experience.为什么要填will have gained 而不填will gain By the time he came.I_____(complete)the work.我已经知道答案,我是初学者.