我已经买了火车票。

Wǒ yǐjīng mǎi le huǒchēpiào.

I already bought a train ticket.

你买到飞机票了吗？

Nǐ mǎidào fēijīpiào le ma?

Did you manage to buy the plane ticket?

快去买公园入场票吧！

Kuài qù mǎi gōngyuán rùchǎngpiào ba!

Quickly go and buy park entrance tickets!