We missed seeing the film when it was shown last week.这里为何不可填完成式 having seen？据我理解，seeing与having seeing都可表达发生在过去的动作，其中后者是表达早于谓语之前发生且是临时性一次性的动作。而seeing可表示一般的状况/过去发...
老师，书上说虚拟语气用于定语从句定语，从句和主句的时态，可以参照虚拟条件从句和主句的搭配。那么Anybody who should do that would be laughed at.就相当于If anybody should do that, he would be laughed at. 这个例子可以证明上面所说的——表...
...bserved about… … 或It has been well
observed that … … ？2)
时态问题: 句中has been
observed of … 指的是已经被观察了（现在之前发生过的一次），还是一直被观察（一直持续到现在的状态）？Observe不是短暂动作动词，对吗？所以，...
Putin says Russia to target U.S. if missiles put in Europe.
老师说新闻标题省略Russia后省略了is,missiles后边省略了were如果是虚拟语气的话那么第一段President Vladimir Putin signaled Russia will aim new weapons at the U.S. if it stations missiles in Europe after quitting...
He ____ the key, so we ______ into the office.A. hadn't left; can't B. didn't leave ;couldn't have got C. hadn't left; could't getD. hasn't left; could't get答案是B，还是C？谢谢!
The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.A. had lost B. would have lost C. would lose D. should have lost请问：应该选哪个？ had...
1, I didn't go there two years ago.2, I didn't go there two years before.3, I didn't go there before.4, I haven't been there before.5, I haven't been there two years before.6, I hadn't been there two years before.老师 这些句子中哪些是错误的？为什么...
1.这是今天看到的一句话，我怀疑是否有错误：If you were a fern, I'd say you have a fatal lack of chlorophyll.虚拟语气的主句是个复合句，我的疑问是复合句的从句是否应该遵循“主过从过”呢？也就是说have是否应该改为had？2.We are going to f...
When the Internet was
invented, it changed the world.When the Internet was
invented, it changes the world.请问老师，是changed还是changes？也就是说，如果从句是过去时，但是主句的范围覆盖到现在，那么是主句是应该用现在时还是过去时呢？谢谢！
What colour _____ you _____ this bookcase? I _____ it pink.A. are; going to paint; am going to paint B. do; paint; paint C. did; paint; painted在这道题目中，没有明确的时间标志词，如何判断选项呢？正确答案选A
老师，您好！The dress was rather more expensive than I was expecting it would be, so I didn't buy it.我对“I was expecting it would be”不理解:疑惑是:1）进行时表达了什么味道？2）如何分析这里的句子结构和成分呢？还有，这句话如何翻译成中文...