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问题 表示“所以”的so前面可以不用逗号吗

Times have changed so we need to change with them. 时代改变了，所以我们需要随时代而改变。 上面这个句子的 so 前面为什么没有逗号呢？这个逗号是可以省略呢还是印刷时漏掉了？谢谢老师解答！

问题 是不是应该把what换成which.

When we think about things in some way,the perspective with what we look at them for the first time remain in our mind.  感觉这个句子有错误

问题 主句是一般过去时before从句可用过去完成时吗

He left the station before I had hurried there. 这个句子主句的动作发生在先，为什么从句用过去完成时？ 换句话说，如何理解主句是一般过去时而before从句是过去完成时？  

问题 系动词be后可以用主格代词吗

The critic is he who can translate into another manner or a new material his impression of beautiful things.这句话来自The Picture of Dorian Gray序言的第二段开头。

问题 如何判断非谓动词做后置定语还是状语

...下来感觉怪怪的。2.seated部分总觉得是非谓语动词做后置定语，但这里是状语，到底该怎么判断区分呢？是因为是独立主格所以做状语吗？

问题 如何理解这里的should at this time have been呢

...een my profession -- I was brought up for the church, and I should at this time have been in possession of a most valuable living, had it pleased the gentleman we were speaking of just now."此刻，这个人正在说话，那么，I should at this time have been ... 不是矛盾了吗？我的意...

问题 “打在脸上”可用介词in也可以用on吗

...”，英语通常是说 hit sb in the face，因为脸属于比较软的部位，故要用 in，不能用 on，但如果是打在 nose 上，则要用 on 了。但是，我看到这样一个句子，用的是 on，有问题吗？ He saw the teacher hit the girl on the face, but he dared not s...

问题 不定式复合结构的判断

...时见到他。这里的结构我个人更倾向于 不定式做chance的定语 for a chance to win.....整体做状语。为了一个.....的机会。还有一个问题想要青椒for表示为了....是引导的什么状语呢？

问题 语病修改

...current moment . 我认为refers to the current moment作为修饰应该是定语从句或者加个逗号改成并列句，这样写在后面是不是因为变成了两个谓语所以不对？应改为In the example you suggested, "From now "also works as now，which refers to the current moment . ...

问题 born, natural（天生的）的区别（2015高考全国卷Ⅱ语法填空）

... and are now cold enough to cool the house during the hot day; at the same time, they warm up again for the night. This cycle goes day after day: The walls warm up during the day and cool off during the night and are thus always a timely offset (抵消) for the outside temperatures. As natural archi...

问题 who从句能否表示the person that从句的意思

what从句有时候不表示疑问，表示the thing that从句的意思，比如，what he said is right.who从句可以这样吗？能否表示the person that从句的意思？

问题 as引导的倒装问题

... movement has been punched,as has been the students.我想请问下这里as引导的倒装，如果是完成时的被动或者进行态的话，是把have been放前面，还是只把have放前面就行了？ 2.如果是have been放前面的话，为什么否定副词的倒装是把have放前...

问题 what和whatever

I think the doctor is able to care of whatever is the matter with your son.这里的whatever是否可以改为what？即of 后是what引导的名词性从句。

问题 now that, as, since的区别

now that, as, since 在引导原因状语从句的区别是有何区别？请多举几个例子, 谢谢!

问题 while although 的区别

Although senior citizens can contribute to society, I would argue that this demographic change can bring some problems. 这个句子中的although 是否可以替换成while？同样是引导让步状语从句，while 和although 有什么区别么？ 谢谢老师的回答