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, how do you like it so far?
好了， 到现在为止， 你们感觉怎么样？
The roofer is patching the roof with metal.
屋面防水工在用铁皮修补屋顶。
Good. That's just what we want to hear.
很好，那正是我们想要听的。