欠条

他给我写了一个欠条。

Tā gěi wǒ xiě le yīgè qiàntiáo.

He wrote me an IOU.

我给了朋友一笔钱，他给我写了张欠条。

Wǒ gěile péngyǒu yībǐ qián, tā gěi wǒ xiě le zhāng qiàntiáo.

I gave my friend some money, and he wrote me an IOU.