must not 表示禁止,一定不要这样做.

例句:You must not come.你一定不要来.

can not 表示（1）不可能 （2)没有能力做=be able to

例句:He has gone abroad,it can not be him.他去国外了,那个人不可能是他.

相关介绍

We must not become complacent about progress.

我们决不能因进步变得自满。

She knew she must not fall prey to his charm.

她清楚她绝不可以被他迷住。

It can not be measured in terms of money.

这是不能用金钱衡量的。

We can not make heavy concession to the matter.

我们在这个问题上不能过于让步。