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问题 yet从句为什么用过去完成时

...ly that’s the point of trials, as opposed to springing a half-baked idea on the country without having first tested it.句中yet their beds had turned out to be needed为什么用过去完成时，as opposed to springing a half-baked idea on the country without having first tested it.在句中是...

问题 请问for与of在“it is adj”中的具体区分

您好！我对以下句子中介词for用法不太理解：It is wonderful for you to be a volunteer.既然在“it is adj.”结构中，of表示对人行为、品质的评价，for表示客观事实。那么，“你做志愿者真是好极了”，应该是指对人“做志愿者”这一行动...

问题 It is...since...的主句与从句时态

It was three years since Jack had been a teacher.It is three years since Jack was a teacher.请问这两句有什么区别吗？分别是什么意思？第二句为什么不用has been呢？

问题 This is the first time that从句时态

我们都知道This is the first time that从句时态常用现在完成时，请问还可以用别的时态吗，比如一般现在时？

问题 sail in a convoy to Russia中的介词in可换成for吗

The Karen had been sailing in a convoy to Russia when she was torpedoed by an enemy submarine.这里为什么用 in，能换成 for 吗?

问题 请问what a challenge that is!在句子中是宾语从句吗

we all know what a challenge that is!请问这个是省略了that 的宾语从句吗，what a challenge that is作为感叹句还是what引导的宾语从句，what作为定语修饰 a challenge谢谢各位老师

问题 in和into

divide the pastry in/into half.    divide them in/into groups.请问这里用in和into有什么区别？！！！

问题 with eyes closed 与with eyes closing

He  sat there with his eyes closed．他闭目坐在那儿。  请教老师，可以说是with his eyes closing吗？人体的一部分,如眼睛,可以是动作的发出者吗？还是只能作承受者？谢谢老师。

问题 reciprocal, empirical, emphatic, theoretical辨析

Until people could conduct experiments from outer space, there was no ______proof of Einstein's Theory of Relativity, E=MC2.A. reciprocal      B. empirical      C. emphatic          D. theoretical选择哪个正确选项呢？怎么理解句...

问题 Never did they...与 Never would they...

There was a man who had four sons. Never did they stop quarrelling with one another. 我觉得 would 也是可以的，表示过去常常，不知道对不对。    

问题 the key to success is to be ready at beginning.

The key to success is to be ready at beginning.老师，这里为什么用to be ready不能写成 the key to success is ready at beginning吗？

问题 effect是什么词性（为什么会出现have和is两个谓语动词）

Since laughter dose effect the body,mind and spirit the only thing you have to do to lead a happy life is laugh.这里的effect是什么词性？后面的一句话为什么会出现have和is两个谓语动词?

问题 all 的用法(that is all that matters)

As long as you are happy, that is all that matters.请问这个句子中all的用法是怎么回事? 谢谢!!

问题 a brief period lying 有错吗（a brief period后面能直接动名词吗）

前面有网友提了一个问题： https://www.cpsenglish.com/question/60080/answer/68069 'Rest', in terms of muscle relaxation and so on, can be achieved by a brief period lying, or even sitting down. The body's tissues are self-repairing and self-restoring to a degree, and function best when m...

问题 He spends too much time (in) helping others. 句中in的使用是否正确

...览本网问答时，发现这样一个问题：He spends too much time (in) helping others. 网友采纳的解答为：有介词 in 时，是介词短语作状语；没有介词时，是现在分词作状语。见：https://www.cpsenglish.com/question/26175  对此本网不同老师有不同解...