jim has been studying since he come home 为什么用since

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• jim has been studying since he come home 为什么用since
• 1.By the time you get back,great changes___in this area.为什么用问will have taken place?2.On his next birthday he __marries for ten years.用will have been 为什么不用has been?3.john _____now for the light in his room is still on .为什么选must be studying而不选must be studying?4.、I_____tennis quite well,but I have not had time to play since the new year.为什么用play不用played5.——Has sam finished his homework today?——I have on idea .He_____it this morning.为什么选was doing不能选has do
• jim has been studying since he come home 为什么用since
• 用所给词的适当形式填空：1.She's been ___(swim) for two hours.2.Miss Zhao ___ (teach) us English last year.3.Jim was the ___ (one) student to get to school this morning.4.He wants a new pair of ___(skate).5.I've been studying Japanese since I ___ (work)on the farm.6.The machine is running ___(顺畅地）now.7.Has anyone any other ___（建议）to make?8.Li Jian is the ___(优胜者）of the contest.9.It's my ___(私人秘密）.It's nothing to do with anybody.10.Haven't you ever ___(听说）anything
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