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
I did make a difference in town.
我确实在镇上发挥了影响力。
I couldn't get through.
电话打不通。
In the young there is a justification for this feeling.
青年人有这种感觉是情有可原的。