不能的英文：
cannot
must not
should not
- They had some trouble once over a halter, and, both being good haters, there was bad blood between them.
他们两人以前为了缰绳的事发生过一些龃龉，因为两人都是记仇记恨的人，所以宿怨不能消解。 - Impurity of the water made it unfit to drink.
因为水质不纯净，所以不能饮用。 - Alas, she could not judge.
可惜她不能作主。 - If love and friendship can't be together, I will abnegate the resultless love.
如果爱与友情不能并存，那我定会舍弃一份无结果的爱。 - Don′t judge a person by the clothes he wears
不能以貌取人 - One can't generalise.
不能一概而论。 - immune to persuasion.
不能被说服的 - Scratch a Russian, and you('ll) find a Tartar.
文明不能改变本性。 - An oak is not felled at one stroke
万事不能一蹴而就 - The white people are unable to isolate the black.
白人不能孤立黑人。
v. 不能，无法
- This achievement cannot be bettered.
这一成就好得不能再好了。 - If you have a bad cold you cannot taste.
如果患了重感冒，就尝不出味道。 - The received wisdom is that they cannot win.
大家一致认为他们不会赢。
v. 必须，必然要
n. 必须做的事，必不可少的事物
adj. 不可或缺的，必须的
- We must act, we must act quickly.
我们必须行动，立即行动。 - You must synthesise various opinions.
你必须综合各方面的意见。 - You must not relax your efforts.
你不可以松懈你的努力。
aux.v. 应该，应当；本应，本当；假如，万一；可能，可以
- Should there be a flood, what should we do?
万一发生水灾我们怎么办？ - You should do as the law prescribes.
你应该按照法律的规定做。 - You should consider his youth.
你应体谅他的年轻。