这个问题有点复杂，你可以再说一遍吗？

Zhè ge wèntí yǒudiǎn fùzá, nǐ kěyǐ zài shuō yí biàn ma?

This question is a bit complicated; could you say it again?

考试前我们要好好复习。

Kǎoshì qián wǒmen yào hǎohǎo fùxí.

Before the exam we need to review well.

这个周末我打算复习一下上次学的语法。

Zhè gè zhōumò wǒ dǎsuan fùxí yíxià shàng cì xué de yǔfǎ.

This weekend I plan to review the grammar we learned last time.