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
What are you doing this weekend?
你本周末打算干什么？
Would you speak a little louder?
请你说大声一点好吗？
May I propose that we break for coffee now?
我可以提议休息一下，喝杯咖啡吗？