请排队。

Qǐng páiduì.

Please line up.

上车要先排队，不要挤。

Shàngchē yào xiān páiduì, búyào jǐ.

You should line up before getting on the bus; don't push.

餐厅外很多人在排队。

Cāntīng wài hěn duō rén zài páiduì.

Many people are lined up outside the restaurant.