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

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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
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

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
by 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.

都是基础语法问题，第一个是将来完成时态，第四个是一般现在时，最后一个表示一段时间内持续做的事情。你要多看简明英语语法

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by 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。
回答者：水野树子 - 高级魔法师六级 1-11 20:36

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1第一题应该是一个假设句，这从get用原形而不用got可看出来，所以这就相当于将来完成时时，意思就是：当你回来时（现在还没回来），这个地区会发生很大的变化，所以···2因为是下个生日，所以···3我想楼主想写的应该是为什么用must be studying 而不用must study吧，now表示是现在进行时4因为had time 中的had 是一个实义动词，表示“有”，与前面表示现在完成时的have不同，不能加过去分词，所以后面有动词的话要用动词不定式，最后一个因为如果选has done话，那前面就会用yes ,he has.而不用I have no idea 了，所以排除法就是······我觉得如果第一个题出来的话，我们全班都会错，包括我，呵呵，题真的不错

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by the time ,by then 1.You can know the time by your watch or c_. B--- will be ready by the time you have dressed. B_____ will be ready by the time you have dressed. You can know the time by watch or c By the time by the time The harder you work,the more knowledge you will ge What the time by you watch 这局话的中文意思?为什么用by? 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 1.By the time you arrive in London we _____ in Europe for two weeks.考什么? If you are famous,pepole will watch you __________and follow you everywhere.A.all the timeB by the time C on time D at time解题思路 Have you got the time by any chance?麻烦好心人翻译以下.Thank you a million! When we pass by the time,my dear,you know,I've been waiting for you? 用by the time造句! by the time怎么造句? by the time +现在式造句 by the time 的用法