状态连接动词（Be verbs）：表达状态、关系、属性、身份
Be动词基本上属于“连接”动词（Linking verb），连接形容词或名词属性：
She is nice.
She is a teacher.
这类动词用于“静态的”连接，不牵涉到动作，只是用来描述状态或状态变化：
状态：be、seems、appears
状态改变：become、get、turn into
后面可以接表达外在或内在特征的形容词，如：
He is / seems / appears tall. → 外观状态
He is / seems / appears sad. → 心情状态
His face turned green. → 外观变化
He got / became angry. → 心情变化
She is a vegetarian. → 常态事实
She became / turned into a vegetarian. → 状态改变
——劉美君. (2012). 英文文法有道理! 重新認識英文文法觀念. 聯經.
