我们赶快天黑前离开这里吧。

Wǒmen gǎnkuài tiānhēi qián líkāi zhèlǐ ba.

Let’s hurry and leave here before it gets dark.

我要赶快告诉他这件好消息。

Wǒ yào gǎnkuài gàosu tā zhè jiàn hǎo xiāoxi.

I need to tell him this good news right away.

赶快趁热吃，菜冷了就不好吃。

Gǎnkuài chènrè chī, cài lěng le jiù bù hǎochī.

Hurry and eat it while it’s hot—once it gets cold, it won’t taste good.