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问题 at different time还是at different times(2016四川卷)

While the effect of cows milk harvested at different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who are struggling to fall asleep at night.请问这里的 time 为什么不用复数？

问题 现在分词的完成被动式与不定式的完成被动式

Some Martian rock structures look strikingly like structures on Earth that are known ______ by microbes.A. having been createdC. to have been createdC是正确答案，可是A和C都可以表示非谓语的动作先于谓语动词的动作，为什么不能选A?

问题 join和join in的用法

...u want to know more about trees, join our "All about trees" talk at 4 p.m. on 26 October.We will interview Dr Jones about the lives of trees and their major uses.请问这句话中用了join而不是join in，talk我理解是谈话或讲座之类的活动，但参加活动不应该用 join in吗？j...

问题 三个并列的宾语从句是否可以省略引导词that

...that they were so quiet, that she was the only person talking in class and it felt like the children were punishing her by making her talk to the walls!第一个宾语从句是：that they were so quiet第二个宾语从句是：that she was the only person talking in class第三个宾语从句是...

问题 句子成分分析

...相修饰的包含关系，还是分别修饰动词的平行关系）：1. It turns out Einstein returned to considering his disgraced cosmological constant lambda later in his life.中的later+in his life2. bring it back to my room.的back+to my room

问题 现在完成时未完成用法与现在完成进行时的区别

...直持续到现在的动作,并且还将持续下去.的用法有何区别It has been raining for two hours.与It has rained for two hours.两句是否都可以理解成雨一直下了2个小时，而且还没结束，还有可能继续下下去。谢谢!

问题 a quite short time有错吗(涉及不定冠词与quite连用时的位置)

有本词典上说，quite 放在 a 或 an 的前面而不是后面，所以：要说：quite a short time 相当短的时间不说：a quite short time 相当短的时间但我在语法书上看到：若名词前有形容词修饰，则a (an) 放在quite / rather之前或之后均可。如：It’s...

问题 动词用推定性或推断性should与用虚拟语气有何不同

...I didn’t intend that they should know at this stage.We intend them to do it / that they shall do it.I intend that we shall arrive tomorrow.我没看懂上面这段话。什么叫推定性should？它与虚拟语气有何不同？上面的例句是如何体现这一点的？

问题 both的用法

...sp;            It is both an art and a discipline.                              It is both...

问题 rather than 用作并列连词，介词，从属连词的区别？

...成成句2）吗？3）Let's finish the job today, rather than leaving it till tomorrow.  介词4）=  Let's finish the job today, rather than leave it till tomorrow. 连词？句3）可以改成成句4）吗？章振邦高级英语语法书上同时说:5）Rather than go by air, I...

问题 定语从句中关于介词加关系代词做关系词的疑问

句子如下：I have never been to Paris, but it's the place____.A. I most want to visitB. in which I would like to visit答案我知道选A，但是老师们我有一个疑问。关系代词做介词补语，介词通常前置。然后B选项，如果把介词后置，which I would like to visit i...

问题 动词的省略和替换

...er told him ________. A. not to     B. not to do       C. not do it答案给的是C，给的解析是这里省略了相同的成分ride his bicycle in the streets. 然后不能选C的原因是do后面要有it。可是在章振邦先生的《新编高级英语语法》中（P1298）提到...

问题 如何理解这四个had had had had

有这样一个句子All the money that he had had had had no effect on his happiness.请问如何理解句中的四个had had had had啊！

问题 The extent to which 引导的是什么从句

VFM: the extent to which a government, business person or consumer gets a good deal from the money which they spend on goods or services.The extent to which 引导的是什么从句？which后面是不是省略了that呢？which后面的从句不缺成分，是不是可以由此判断出which引导...

问题 come doing 与 come to do 的用法区别

什么时候用 come doing 什么时候用  come to do？比如：To be safe, I stayed with a “pack” of bikers while cars on the streets came running swiftly out of nowhere at times. I didn’t want to get hit. So I took the ride carefully.这里为什么用 come doing 呢？