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's the schedule today?
今天的工作是怎么安排的？
I must admit I had my doubts.
我必须承认我当初是我疑虑的。
The tiny painting proved to be an unknown masterpiece by Correggio and was worth hundreds of thousands of pounds.
那幅不大的画原来是柯勒乔的一幅未被发现的杰作，价值几十万英镑。