句中“cannot…too…”意为“无论怎样……也不过分”或“越……越好”。该句型中的not可以换成hardly、scarcely或never；too可以换成over、enough、sufficient或sufficiently等，意思不变。
You cannot be too careful while crossing the road.
过马路的时候再小心也不为过。
He can't be too cautious.
他怎样小心注意也不算过分。
One cannot be too modest.
一个人越谦虚越好。
We cannot admire her beauty too much.
我们怎么赞美她的美丽都不为过。
You cannot be too careful in the choice of your friends.
你在择友方面再怎么小心也不为过。
One cannot be too careful in guarding Party and state secrets.
保守党和国家的机密，慎之又慎。
We cannot be too careful in doing experiments.
我们做实验无论怎样小心也不会过分。
We cannot put too much emphasis on grammar when learning written English.
学习书面英语时，我们再怎么强调语法也不为过。
You cannot trust him too much.
你再怎么信任他也不为过。
You cannot be too careful.
你再怎么小心都不为过，越小心越好。
As a doctor，you can't be too careful.（译林版九年级英语上册Unit1 Reading）
作为一名医生，你再怎么仔细也不为过。
One can't be too honest.
人越诚实越好。
A man can never have too many friends.
朋友越多越好。
A kid can never have too many toys.
孩子永远不会嫌玩具多。
A man can never have too many ties.
男人永远不嫌领带多。
A woman can never have too many clothes.
女人永远不嫌衣服多。
You cannot be too hard-working.
你再怎么勤奋都不为过。
We cannot be too faithful to our duties.
我们再怎么忠于职责都不为过。
We cannot work too much for the people.
我们为人民做工作是不可能做过头的。
We can't praise our motherland too much.
我们再怎么赞美我们的祖国都不为过风。
Cannot+动词+too many +可数名词
Cannot+动词+too much +不可数名词
It is wrong to think that one cannot bear too many children.
认为一个人孩子生得越多越好是错误的。
I think it right that one cannot learn too much knowledge.
我认为一个人的知识愈多愈好。
I cannot thank enough for your kindness.
我再怎么感谢你的好意也不为过。
You can hardly praise this film too highly.
= You can't praise this film too much.
= You can't praise this film highly enough.
这部电影评价再高也不为过。
有时也可用impossible等与too连用来表示类似意思。
如：
It is impossible to get there too soon.
去那里越早越好。
It is impossible to emphasize this point too much.
怎么强调这一点都不过分。
We cannot be too patient with others.
我们对别人无论有怎样大的耐性都不过分。
It is impossible to over-estimate the importance of the development of industry in China.
=We cannot over-estimate the importance of the development of industry in China.
=We cannot estimate too much the importance of the development of industry in China.
在中国发展工业，无论如何重视也不为过分。
We cannot speak in terms of too high praise of his merits.
=It is impossible/difficult to speak in terms of too high praise of his merits.
他的功绩无论怎样赞扬也不为过。
试比较：
We should not be too patient with them,
我们对他们不应太过忍耐。
You cannot pay too much attention to your English study.
你对英语学习再怎么重视都不为过分。
You shouldn't/mustn't pay too much attention to your English study.
你不应/不可给英语学习太多的关注。
其它的类似表达：
We cannot overemphasize the importance of learning a foreign language.
我们无论怎么强调学习外语的重要性也不过分。
I can't overemphasize the cleanliness of this place.
这个地方的清洁我再怎么说都不为过。
The importance of education cannot be overemphasised.
教育的重要性怎么强调都不为过。
The seriousness of the crime cannot be overstated.
这一罪行的严重性怎么说也不为过。
The importance of participating in the life of the country cannot be overestimated.
参与国家生活的重要性再怎么说都不为过。