我快要睡觉了，你明天再打电话吧。

Wǒ kuài yào shuìjiào le, nǐ míngtiān zài dǎ diànhuà ba.

I'm about to go to sleep; call again tomorrow.

天快要黑了，我们回家吧。

Tiān kuàiyào hēi le, wǒmen huíjiā ba.

It's getting dark soon; let's go home.

我快要考试了，所以每天都学习。

Wǒ kuàiyào kǎoshì le, suǒyǐ měitiān dōu xuéxí.

I am going to have an exam soon, so I study every day.