everybody作为主语时为单数。
everybody：(某个群体中的)每个人;所有人;人们。
例句：
1、
Tonight, I think he proved to everybody what a great player he was.
我认为今晚他向所有人证明了他是个多么出色的选手。
2、
No one is absent. Everybody's here.
人都到齐了，一个也不缺。
3、
Not everybody can do it.
并不是人人全都能做。
4、
She showed me round and introduced me to everybody
她领着我四处看了看，将我介绍给每个人。
5、
We gave a party and everybody came and I think it was a smashing success
我们举办了一个派对，所有人都来参加了。我认为派对非常成功。