问题 现在完成时中的have been to疑问

有些琢磨不透have been to是怎么一个原理结构？是不是have done+be to=have been to？be to的意思是 将要做，然后加上完成时的形式后 have been to，表示已经做过？包含着一种 非延续性的含义在其中 对吗？然后如果have been to Beijing就表示去...

问题 分析: I'm sorry to leave, mom, I had to go.

I'm sorry to leave, mom, I had to go（很抱歉我要走了,妈妈,我不得不去）请问这里的to leave是指过去离开吗？请问要怎样理解？

问题 分析不定式是什么成分（涉及sth is easy to do, happen to do等）

1. The question is easy to answer.(to answer 做什么成分）2. I happened to meet him in the street.3. He seems to know the truth.

问题 分析 I have no objection to him coming to stay.

to him coming to stay 是objection的定语吗? 能具体分析一下这句话的结构吗？

问题 mean to 与 be meant to 的区别

The track ______（mean）to inspire people’s hearts “with the soft power of music”.这个句子用 menas 还 is meant？

问题 省略to的不定式

I've gotten to the point where I can be around some difficult people without feeling the need to be so reactive fix them to make them happier or want to avoid them.请问此处的so reactive fix them是否应为so reactive to fix them？为何能够省略to？或者是与so相关其他结构？

话题 1 is to 2 what 3 is to 4

话题 关于to do与to have done的疑问

问题 to是介词还是不定式

He attributes his success to hard work.这个句子当中的to hard work中的to是介词还是不定式？to hard work是作什么成分？如何区分to是介词还是不定式？

问题 step to do是定语还是状语

三个待讨论的句子[1] The president took immediate steps to stop the fighting. 来源: 朗文6[2] But there are more steps to be taken. 来源: 林超伦笔译实战[3] We just need to take that first step to changing. 来源: 外媒例句思路:对于[1]，由于take是动态动词，所以...

问题 不定式的否定式（not to do还是to not do）

He told ma to not be sad.老师，not to be sad 等于 to not be sad吗？为什么这样用，二者有什么区别？把 not 放在非谓语里的用法在小说里见过好几次!

问题 be said to do、be said to have done...

be said to do 据说……将作be said to have done 据说……已经做了这里的不定式是作为什么成分呢？

问题 Wake up to的疑惑

Wake up to有没有分开分析的可能 People began to wake up to the severity of this affair.有没有可能分析为主谓结构？ He wake up the people to the severity of this affair等同于He wake the people up to the severity of this affair. 比较take back to

问题 含有to的两个句子结构分析

①We are looking forward to the exper's the expert coming to give us a leture. ②her coming to help encourage all of us. 在①中的第二个to是不定式宾语补足语？ 在②中的to 是逻辑主语的介词 ，help为名词 然后 her coming to help 做主语？ 谢谢！

问题 not to smile，not to touch视作定语还是状语，如果是状语，是充当什么状语？​

It is considered unfriendly not to smileIt is best not to touch unless you are sure the other person is comfortable with it.这两句里的not to smile，not to touch视作定语还是状语，如果是状语，是充当什么状语？