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问题 动词现在式是一个单词还是复合形式

I visit my grandparents four times a month.上文中的visit是do (to) visit的省略形式还是缩合形式，visit是简单的一个普通的单词呢？还是一个类似于can't,am eating,have drunk，would go这样的复合形式呢?谢谢回答。

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。

问题 介词with的用法疑问（用法与句子成分）

With adult children, the parents’ responsibility to set the children straight in most cases has been lifted.请教老师，句中 lift 该如何理解？其次，with adult children 作何成份？此句中with 的用途为何？该如何翻译？谢谢老师。

问题 为什么用 by September 30

—When do we need to pay the balance?—______ September 30.A. In            B. By          C. During        D. Within答案是B。为什么用 by September 30？

问题 无连词让步状语从句

Were the danger even greater, I should feel compelled to go.书上说，从副词even可以看出来，这是一个无连词让步状语从句=Though the danger were even greater。我的迷惑是：1）为什么说从副词even就可以看出来， 如何理解？2）让步状语从句通常采用...

问题 keep sth done的疑问

He tried to keep his head turned decently away.曹老师您好，这里请教您一下，turn away（转头）应改是个短暂动词，这里为什么能和keep连用? 短暂性终止动词在状态改变后难道可以和延续动词一样表示状态吗? 比如 close，在keep window closed中...

问题 用英语说“儿童公园”可以省略所有格形式吗

Last Sunday my family went to ________.A.the child's parkB.the children' parkC.the children's parkD.the childrens' park

问题 怎么判断介词后面是动名词复合结构还是介宾结构

Like virtual schools operating in other states, Florid Virtual allows faculty to provide personal courses.请问怎么判断operating..是分词定语还是动名词复合结构？

问题 非谓语动词done和being done辨析

The man kept his eyes ____ on his baby for quite some time.A fixed   B being fixed请问这里为何用A ，非谓语动词做宾语不是只能用to do 或 doing 吗？

问题 do everything one can do的省略规则

He did everything he could (do) to help us.请问这句话是否可以理解为省略了括号中的部分呢？如果可以的话，省略的规则是什么呢？

问题 There be 句型中 there be 做什么成分

1.There was a river which crossed the area from north to south.中there be 是什么成分？2.there be 都可以做什么成分？谢谢

问题 不及动词的过去分词可以作后置定语吗

请问：不及动词的过去分词可以作后置定语吗？比如看到这样一句：A man just come back from India is said to have suffered COVID-19.这个句子的 come back from India 是修饰 man 的后置定语吧？难道不及动词的过去分词也可以作后置定语吗？

问题 “金钱”作主语谓语必须用复数吗

Is / Are five million dollars enough to make a good film?上面一句摘自高中英语译林版新教材必修二第1单元第7页。它要求圈出正确的单词（circle the correct words）。我看语法书说的是：“金钱”作主语时谓语动词通常用复数，按上面这题的意...

问题 than后面可以直接加if从句吗

尊敬的老师，学生想咨询一下than后面可以直接加if从句吗? 就比如这句话：These shares may fetch less than if their owners had waited for their employer to go public.这些股票的价格可能低于其所有者等到其雇主上市时的价格。

问题 介词+which和where在什么情况下不可以互换

The ladder on which I was standing began to slip 这里的on which 为什么不能用where替换