我在图书馆看书。

Wǒ zài túshūguǎn kànshū.

I'm in the library reading.

我每个星期都去图书馆学习。

Wǒ měi gè xīngqī dōu qù túshūguǎn xuéxí.

Every week I go to the library to study.

我在图书馆里找不到我想要的书。

Wǒ zài túshūguǎn lǐ zhǎobudào wǒ xiǎng yào de shū.

I didn't find the book I want in the library.