5. cannot ＋动词＋ too many ＋可数名词 / too much ＋不可数名词，例如：
I think it right that one cannot learn too much knowledge. 我认为一个人的知识愈多愈好。
It is wrong to think that one cannot bear too many children. 认为一个人孩子生得愈多愈好是错误的。
6. It is impossible （ difficult ） to…… too…… ＝ cannot……too…… ，例如：
It is impossible to emphasize this point too much. （＝ One cannot emphasize this point too much. ）要特别强调这一点。
与 cannot……too…… 相似的结构主要有：
1. cannot help + doing ：该结构意为“禁不住做……”、“忍不住干……”，指“身不由己地去做某事”。例如：
We could not help thinking when we saw the Great Wall in China.
看到中国的长城，我们不禁浮想联翩。
I couldn't help crying when I heard the bad news. 听到那不幸的消息，我忍不住大哭起来。
“ cannot help but do sth. ”也表示“不得不、忍不住……”。例如：
We could not help but walk from dawn to dusk. 我们不得不从黎明走到黄昏。
Hearing the inspiring news， we couldn't help but cheer. 听到这个鼓舞人心的消息，我们不禁欢呼起来。
2. cannot but do sth ：该结构表示“不得不……”。例如：
I cannot but admire his courage. 我不得不钦佩他的勇气。
I couldn't but laugh on reading such a funny joke. 读到如此滑稽的笑话，我忍不住笑了。
在上面句式里，可以说 cannot 后面省略了 do anything .例如：
The prisoner could not （ do anything ） but hand in his knife. 那个犯人不得不交出刀子。
can but do sth. 表示“只得做某事”。例如：
The boy made an apology to his teacher， so the teacher could but give up the idea of punishing him. 那男孩向老师道了歉，老师只得打消惩罚他的念头。
类似这一结构的 cannot choose but to sth 也表示“不得不……”、“只得……”。例如：
It rained hard， so they couldn't choose but stay at home. 雨下得很大，他们只得呆在家里。