这支黑色的笔写得很顺。

Zhè zhī hēisè de bǐ xiěde hěn shùn.

This black pen writes very smoothly.

桌子上有三支笔，你可以选一支。

Zhuōzi shàng yǒu sān zhī bǐ, nǐ kěyǐ xuǎn yì zhī.

There are three pens on the table; you can choose one.

请把那支蓝色的笔借给我。

Qǐng bǎ nà zhī lánsè de bǐ jiè gěi wǒ.

Please lend me that blue pen.