copula

n.[语法]系动词(如be,seem,appear等),[逻](命题主词与谓词间的)连系

连系动词；等号；联系助动词

名词

1、"Be" and "become" are copulas in English grammar.
在英语语法中，“be”和“become”都是连系动词。
2、In the sentence "She is a teacher," the verb "is" functions as a copula.
在句子“她是一名老师”中，动词“is”起到连系动词的作用。