今天给高中孩子上课时，发现有这么一道题。
Say sorry if you are mean to someone. You can write a message or talk to the person. Think about how to be kind in the future. We _____ help to say no to bullying.
完形填空讲的是如何杜绝校园暴力，空白处需要选择A. can all还是B. all can.
单独把这两句拿出来
We can all help to say no to bullying.
We all can help to say no to bullying.
貌似也没什么区别。
真的没有区别吗？
开始研究我照理搜索了一下有道例句，发现两种用法（we can all和we all can）都有。
图片来自有道电子词典
图片来自有道电子词典
所以，这就不再是一个单纯的语法问题，这一定是一个语用问题。
牛津字典上怎么说？All有三个词性：限定词、代词、副词
王兴刚老师做图
限定词例句：
All horses are animals, but not all animals are horses.
He has lost all his money.
代词例句：
They all enjoyed it.
All of them were invited.
副词例句：
She was dressed all in white.
He lives all alone.
- 对于代词词性来说：
我们开篇的问题all也是we的同位语，属于代词的用法。所以：
we（主语） all（同位语） 动词 = all of us 动词
理解起来，不是难事儿。
- 对于副词词性来说：
