Copula
n. 系詞, 介體, 接合部\\n[醫(yī)] 介體; (舌)聯(lián)桁; 交配
? 同義詞
?? 牛津釋義
copula
n
(grammar) type of verb that connects a subject with its complement 系詞（即連系動(dòng)詞, 用以連結(jié)主語(yǔ)及其補(bǔ)語(yǔ)）
In `George became ill', the verb `became' is a copula. 在Georgebecameill一句中, became是系詞.
??? 情景例句
She's the apple of my eye.
她是我的至愛(ài)。
Do I have to reserve a seat?
我一定要預(yù)訂座位嗎？
I'm sorry.We don't have any.
對(duì)不起，我們沒(méi)有。