我买了去北京的机票。

Wǒ mǎi le qù Běijīng de jīpiào.

I bought a plane ticket to Beijing.

你买机票了吗？

Nǐ mǎi jīpiào le ma?

Have you bought the plane ticket?

机票在我的桌子上。

Jīpiào zài wǒ de zhuōzi shàng.

The plane ticket is on my desk.