Try it before you buy it.

购买前先试试。

Can you change your clothes before you come?

你能在来之前换衣服吗？

And I'll be at school before you.

我会比你先到学校。

And before you begin, you should smile at her!

在你开始之前，你应该对她微笑！

You must look right before you cross the road.

过马路前你必须向右看。

And I'll be in Scotland before you.

我会比你先到苏格兰。

You pay for online shopping before you receive it.

你在收到网上购物的商品之前付款。

You must ask people before you take photos of them.

你拍照前必须先征得别人的同意。

Check your answers in Before You Watch.

在“观看前”中检查你的答案。

Book your ticket before you book your hotel.

订旅馆之前，先预订机票。