1.By the time you get back,great changes___in this area.

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/24 15:57:11

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 done

y the time所跟时态要看主句和从句两个方面.但可以肯定的是,主句肯定是完成时.
这里从句是you get back,是条件句,用一般时态表示将来.意思是：你一回来,就会发现这个地方发生了很大的变化.所以主句用将来完成时.
next birthday 将来的日子,怎么能用一般时态has表示呢?用将来完成时
must be studying表示肯定推测,肯定还在看书,因为灯还亮着.
but后面的句子意思是：自从新年后,我就没有时间再玩了.前面是叙述一般事实,我网球打得不错.所以用现在时.没有必要用过去式.
was doing说明说话人看到Sam的时候他正在做.强调正在做这个动作.而且用has done说明已经做完.和i have no idea不符.

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