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
Where's your father?
你爸爸在哪？
No, I don't. Will it be a problem?
不，我没有，会有困难吗？
Yes, I took it after breakfast.
吃了，我早饭后就吃了。