餐厅的卫生间在左边的走廊里。

Cāntīng de wèishēngjiān zài zuǒbiān de zǒuláng lǐ.

The restaurant's restroom is in the corridor on the left.

请问，卫生间在哪里？

Qǐngwèn, wèishēngjiān zài nǎli?

Excuse me, where is the restroom?

请问哪里有卫生间？

Qǐngwèn nǎlǐ yǒu wèishēngjiān?

Excuse me, where is the bathroom?