不 bù / 没 méi

他们 不 是 坏 孩子。

Tāmen bù shì huài háizi.

They are not bad kids.

你 不 喜欢 我 吗?

Nǐ bù xǐhuan wǒ ma?

Do you not like me?

我 没有时间。

Wǒ méiyǒu shíjiān.

I don't have time.

这 个 不 贵。

Zhège bù guì.

This is not expensive

我 没去 上班。 / 我 不去 上班

Wǒ méiyǒu qù shàngbān. / Wǒ bùqù shàngbān.

I didn't go to work. / I don't/won't go to work

我 没有 喝 你 的 啤酒。/我 不 喝 你 的 啤酒。 (the 有 here is not needed, but it could be here sometimes)

Wǒ méiyǒu hē nǐ de píjiǔ. /Wǒ méiyǒu hē nǐ de píjiǔ.

I didn't drink your beer. / I don't/won't drink your beer

我 哥哥 不 高,但是 很 帅。

Wǒ gēge bù gāo , dànshì hěn shuài .

My older brother is not tall, but he is very handsome.