这个问题很简单嘛，你一定能解决的。

Zhège wèntí hěn jiǎndān ma, nǐ yīdìng néng jiějué de.

This problem is very simple, you can definitely solve it.

别生气嘛，我只是开玩笑而已。

Bié shēngqì ma, wǒ zhǐshì kāiwánxiào éryǐ.

Don't be angry, I'm just kidding.

她没事的嘛，只是有点累而已。

Tā méi shì de ma, zhǐshì yǒudiǎn lèi éryǐ.

She's fine, just a bit tired, that's all.