Word: 不得

你太老了，做不得这种事了。

Nǐ tài lǎole, zuò bùdé zhèzhǒng shì le.

You're too old to be doing this kind of thing.

我们可犯不得错误。

Wǒmen kě fàn bùdé cuòwù.

We can't afford mistakes.

我哭不得，笑不得。

Wǒ kū bùdé, xiào bùdé.

I don't know whether to cry or to laugh.

我记不得最后看的什么。

Wǒ jì bùdé zuìhòu kàn de shénme.

I don't remember what I was watching in the end.