椅子

In a sentence

• 这张椅子很舒服。

  This chair is very comfortable.

  The word '椅子' ('chair') is used as the subject of the sentence to refer to a specific piece of furniture.

• 她喜欢坐在椅子上读书。

  She likes to sit on a chair to read.

  Here, '椅子' ('chair') is used as the object of the preposition '上', indicating the location where the action happens.

• 房间里有五把椅子。

  There are five chairs in the room.

  The term '椅子' ('chair') is used in plural form, indicating various chairs as items in a countable context.