Copula
n. 系词, 介体, 接合部\\n[医] 介体; (舌)联桁; 交配
✅ 同义词
📖 牛津释义
copula
n
(grammar) type of verb that connects a subject with its complement 系词（即连系动词, 用以连结主语及其补语）
In `George became ill', the verb `became' is a copula. 在Georgebecameill一句中, became是系词.
🗣️ 情景例句
Well, you all know I'm working on my photo album.
好吧，你们都知道我正在进行我的写真集。
One good mother is worth a hundred schoolmasters.
一个好的母亲顶得上一百个教师。
How old are you?
你多大了？