I'm with you.

我知道你的意思。

You won't believe this.

你会觉得难以置信。

You must observe these simple rules.

你必须遵守这些简单的规定。

I think we should leave the door open. it's boiling in there.

我觉得我们应该把大门敞着，屋里太热了。

Don't be such a grouch.

不要总是牢骚满腹。

Is that it?

就这个吗？