⇒ 快点走，要不你要迟到了。 (Kuài diǎn zǒu, yàobù nǐ yào chídào le.) Go quickly, otherwise you'll be late.
(要么) either ... or
⇒ 我们要不去看电影，要不去咖啡厅，你说呢？ (Wǒmen yàobù qù kàn diànyǐng, yàobù qù kāfēitīng, nǐ shuō ne?) We can either go to see a film or go to a coffee shop — which would you prefer?