等到你回国的时候，记得给我打电话。

Děngdào nǐ huíguó de shíhou, jìde gěi wǒ dǎ diànhuà.

When you go back to your country, remember to call me.

等到你忙完了，我们再聊天。

Děngdào nǐ mángwán le, wǒmen zài liáotiān.

When you finish being busy, we can chat again.

等到他来了，我们再吃饭。

Děng dào tā lái le, wǒmen zài chīfàn.

We will eat after he arrives.