你真能吃，菜又没了。

nǐ zhēn néng chī ， cài yòu méi le 。

You can really eat, all of the food's gone again.

开玩笑！我在减肥。

kāiwánxiào ！ wǒ zài jiǎnféi 。

You're kidding! I'm on a diet.

减肥还吃那么多？

jiǎnféi hái chī nàme duō ？

You're on a diet and you're still eating that much?

我没吃米饭。

wǒ méi chī mǐfàn 。

I didn't have any rice.