我们一起吃午饭吧。

Wǒmen yìqǐ chī wǔfàn ba.

Let’s eat lunch together.

你今天午饭吃什么？

Nǐ jīntiān wǔfàn chī shénme?

What are you eating for lunch today?

我在办公室吃午饭。

Wǒ zài bàngōngshì chī wǔfàn.

I eat lunch in the office.