今天我请客。

Jīntiān wǒ qǐngkè.

Today is my treat.

为了感谢大家的帮助，他特地请客吃饭。

Wèile gǎnxiè dàjiā de bāngzhù, tā tèdì qǐngkè chīfàn.

To thank everyone for their help, he specially treated them to a meal.

我没带钱，今天不能请客。

Wǒ méi dài qián, jīntiān bù néng qǐngkè.

I didn't bring money, so I can't treat today.