Not only is smoking bad for your health,it's the source of social problems in developing countries because, since profit from tobacco is very high, tobacco has taken up the best food-growing areas,leading to food shortages.请问 because 在这里有什么作用？
All he wants to do is make love.All you're going to do is highlight it.All I have to do is learn English.我注意以上句子is后跟的都是动词原形，我不了解这一语法背后的知识，请老师解疑答惑，如果举几个例句方便理解就更好了，感谢！
为什么这个句子的as是作为方式而不是定语？The editor published the article as it had orginally been written.而下面这个句子实在不明白，为什么as看作方式或者定语都不对呢？His earnings were only half the amount as they used to be.
_____ has been stated in the annual white book,our national defense budget per year is well below the average of develpoed countries.选项是as ,如果我想用as it has been.......这个句型，不是as引导的非限制定语从句，原句子怎么改？
We knew its soldiers were religious, that they
were against photography and music. 《经济学人》上的一句话。看作同位语从句？主体词是宾语从句或者religious？还是看作knew的并列宾语从句，作者遗漏了and？因为作者是阿富汗人，我怀疑可能写得不...
Tea wasn't introduced into Europe until the early 17th century. And now it has _______ popular in Europe and America.这道题给的答案是become，请问可不可以用been呢？如果不行，为什么呢？
Leave your ideas for a chance to win Spurs official open training tickets. 老师请问这个for a chance to win Spurs official open training tickets如何理解。译文为：留言告诉他你的想法，你就有机会在公开训练时见到他。这里的结构我个人更倾向于 不定式做...
Consider this statement by Louis Bromfield ，a noted author:“if I ，as a novelist，wrote dialogue for my characters which was meticulously grammatical ，the result would be the creation of a speech which rendered the characters pompousand unreal.”
老师好。请问，这句话是因为...
There is the need for a local bath house that is now being met.上句for a local batch house是否属于类似的插入语，即应该为There is the need that is now being met for a local bath house ?就是定语从句the need是定语从句that is now being met的先行词吧？ 麻烦老师...
The Asuka period (飛鳥時代, Asuka jidai) was a period in the history of Japan lasting from 538 to 710 (or 592 to 645),为什么这里用a period？而不是the period 后置修饰语应该能够把这个时期修饰到确定的一个，为什么还是a