You'd better watch your step or you'll get into trouble again.

你最好留点儿神， 免得再惹麻烦。

I agree.

我同意。

You must observe these simple rules.

你必须遵守这些简单的规定。

Dreadful weather, don't you think?

天气可真差劲，你说呢？

Keep smiling! things will calm down.

乐观一点，事情会平息下来的。

This is more than I can take.

我再也受不了了。