Meaning of yào bù:
要不
how about...?; either... (or...); or else; otherwise
Wǒmen jīntiān wǎnshàng qù kàn diànyǐng, yào bù qù chī wǎnfàn?
我们今天晚上去看电影,要不去吃晚饭?
We are going to watch a movie tonight, how about going for dinner?
Yào bù wǒmen qù kàn diànyǐng, yào bù wǒmen qù sànbù.
要不我们去看电影,要不我们去散步。
Either we go to watch a movie, or we go for a walk.
Wǒmen kuài diǎn zǒu, yào bù jiù chídào le.
我们快点走,要不就迟到了。
Let's hurry up, or else we'll be late.
Wǒmen xiànzài jiù qù chīfàn, yào bù cāntīng huì guānmén le.
我们现在就去吃饭,要不餐厅会关门了。
Let's go eat now, otherwise the restaurant will close.