by the time he finishes the part-time job,he will have gain

by the time he finishes the part-time job,he will have gain i shall have finished the job by the time he returns from wo He will have learned English for 8 years by the time he----- He will have learned English for eight years by the time he He will have learnt for 9 years by the time he __ (graduate) 翻译By the time he comes,I'll have left.( By the time he came, He will have learned English for eight years by the time he_ BY the time he retires,Professor Baker（will have taught）for I will have left for America by the time he arrives 1.he will have learned english for eught years by the time h he will have been playing on the piano by that time 为什么要用on 语法好的帮忙一个小题,He took the part-time job _______.