我看了几本书。

Wǒ kàn le jǐ běn shū.

I read several books.

我几天没学习了。

Wǒ jǐ tiān méi xuéxí le.

I haven't studied in several days.

你有几个兄弟姐妹？

Nǐ yǒu jǐ gè xiōngdì jiěmèi?

How many siblings do you have?