哪些时候谓语动词用单数像everyone之类的

Question

如题所述

Answer 1

当主语是第三人称单数的时候谓语就用单数形式！
如：
none ,somebody
None knows he's narking for the police.
没有人知道他在给警方做眼线。
Somebody is knocking on the window.
有人在敲窗子。

Answer 2

Frog oocytes have served as model systems for studies of oocyte dev