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问题 怎么分析“介词+副词”的用法(如 until late, on late）

介词短语 until late、on late 中的 late 是副词吗？怎么分析这种“介词+副词”的用法？如：Not until late at night did he come back. 直到深夜他才回来。There's a good film on late. 深夜有一场好电影。怎么分析这种“介词+副词”的用法？

问题 主句是一般现在时 从句为什么要用过去将来完成时

“General Mazloum is willing to negotiate with you, and he is willing to make concessions that they would never have made in the past.”这句话出自10月9日美国白宫给土耳其总统的一封信。句意不难理解，但是我不明白为什么第二句的从句会用过去将来完...

问题 相同句型问句答案不同的困惑

...hasn't it 2) People on the scene must have taken him as a nut when he was doing a performance in the street yesterday afternoon, (didn't they) ?A. mustn't they  B. didn't they  C. hasn't they书上说答案是B. didn't they 对此，我感到非常困惑，以上2个句子属同一种类型，...

问题 truly 和really的区别

有一道题： It is_______nice of you to say so. A. truly B. true C. really D. real 答案选C. 老师讲truly和really 可互换，但really更常用，所以选really。我想请教，本题选A可否，truly和really的区别。请专家赐教，谢谢！

问题 涉及非谓语动词用法的选择题

— Why did you call him up in advance?— _____ sure that he was at home.A. To make    B. Make                C. Making    D. Having made请问选哪个？为什么？

问题 请问这两句话的区别以及正误

I'm sorry to have kept you waiting long.A：Never mind. I waited here for only a few minutes.B：Never mind. I have been here for only a few minutes.以上这两个回答的区别在哪里呢？

问题 Downstream of ... 中的downstream是什么词性

...是名词？我知道形容词后是可以接介词短语的，像kind of you，但这里显然情况不是一样的，请问这里是一种什么用法呢？这里的downstream又像形容词，又像副词，还像名词。有哪位老师可以帮我解答一下这个疑惑吗？不胜感激！

问题 动名词的完成式与一般式用法疑问

Now he regrets not having gone to university . … Mr. Smith regretted blaming his secretary for the mistake, for he later discovered it was his own fault. 按道理说都是在谓语动词之前发生的事啊？也什么不都用having done或者都用doing?

问题 宾语从句是否可以改写为方式状语从句

如 I think I will do it 改成 I will do it by i think.谢谢老师啦！辛苦了！

问题 keep的疑问

如果说keep sb away from doing sth 是阻止某人做某事，那么keep sb fron doing sth 应该是不阻止，即保持某人做某事，事实不是这样。i prevent him from cutting tree.是我阻止他，他原先来自砍树这个状态i keep就是保持，也就是不阻止,可老师还是...

问题 former和was/is的使用搭配疑问？

...可以用is呢？美国之音原句：Evo Dalder is a former U.S. ambassador to NATO.He has made it clear frequently that he not only thinksthat Europeans aren't doing enough, but that......上句用了Evo Dalder is a former U.S. ambassador to NATO.没有用was.因此，Mike is a teacher now, bu...

问题 一道时态选择题(现在进行时还是现在完成时)

You must remember that you'll lose something in the file you ______ on and haven't saved if the computer breaks down.A. are working             B. work       C. will work      D.worked答案为a， 此时为什么用现在时呢？...

问题 句子改错

Because you are aware of people judge you by your table manners. 老师好！这个句子应该把aware of的of改成that，那能不能把judge改成judging?

问题 关于情态动词的表猜测问题

...的将来，所以还是用might+have+done 的结构吗？这个句子：You must have gone to bed late last night. Your eyes are red. 这种句子就很好判断，因为是对过去的猜测。但第一个句子就有点理解不过来，希望老师能解答一下，感激不尽。

问题 现在完成时是否可以与一般将来时连用

有一个单选题：When I ______ this letter, I ______ it to you.A. have written, will show   B. wrote, would show答案是 A，应该如何理解？另外选 B，当做虚拟语气理解有何不可？求教各位老师。