Connecting nouns with 是 ("shi4")

“是”（shì）是汉语中最常用的系动词，用来连接两个名词性成分，表示主语等同于或属于某个类别或身份。

“是” (shì) is the most common copula in Chinese, used to connect two nominal elements, indicating that the subject is equal to or belongs to a certain category or identity.

结构为“A 是 B”，其中A和B都是名词或名词短语。常用于介绍、描述、定义等。注意：在汉语中，“是”不与形容词直接连用；形容词前不需要“是”。

The structure is 'A 是 B', where A and B are nouns or noun phrases. It is commonly used for introductions, descriptions, definitions, etc. Note: In Chinese, '是' is not used directly with adjectives; adjectives do not require '是'.