Copulas
n. 系动词（如be,seem,appear等）, （命题主词与谓词间的）连系( copula的复数形式 )
🗣️ 情景例句
Okay, hold on a second. I'll talk to him.
好的，我跟他说，你等一下。
There's TV coverage of the NBA tournament.
有个NBA联赛的电视报道。
We had a very nice time.
我们过得非常愉快。