前天

qián tiān

the day before yesterday

三天前我到了

Sān tiān qián wǒ dàole

three days ago I arrived

我前天到了北京

Wǒ qiántiān dàole běijīng

I arrived in beijing the day before yesterday

我前两天要去买车票

wǒ qián liǎng tiān yào qù mǎi chē piào

I wanted to buy tickets a couple of days ago.

三天前我买了这个苹果

sān tiān qián wǒ mǎi lè zhè gè píng guǒ

3 days ago i bought this apple

谁在前面？

shéi zài qián miàn？

Who's up ahead?

到前边坐

dào qián bian zuò

Go sit in front

我在你前面

wǒ zài nǐ qián miàn

I'm way ahead of you.

在我家前面

zài wǒ jiā qián miàn

In front of my home.

倒下的树前面

dǎo xià de shù qián miàn

In front of fallen tree

你之前说得对

nǐ zhī qián shuō děi duì

You were right before