教室里有很多桌子和椅子。

Jiàoshì lǐ yǒu hěn duō zhuōzi hé yǐzi.

There are many desks and chairs in the classroom.

教室里的每张椅子下面都有一个书包。

Jiàoshì lǐ de měi zhāng yǐzi xiàmiàn dōu yǒu yí gè shūbāo.

Under every chair in the classroom there is a schoolbag.

请坐在这把椅子上休息一下。

Qǐng zuò zài zhè bǎ yǐzi shàng xiūxi yíxià.

Please sit on this chair and rest for a while.