1. someone, anyone等作主语时

someone, anyone, no one, everyone, something, nothing等复合不定代词作主语，谓语动词用单数：

Someone is asking to see you. 有人找你。 Nobody is to blame for it. 这谁也不怨。

2. all 作主语时

若指人，谓语通常用复数；若指事物或现象，谓语通常用单数： All have gone home. 大家都走了。

All is silent. 万籁俱寂。(指现象)

All are silent. 人人都沉默不语。(指具体的人)

3. either和neither作主语时 若是单独作主语，谓语通常用单数： Neither was satisfactory. 两个都不令人满意。

The two guests have arrived, and either is welcome. 两位客人都到了，哪一位都受欢迎。

【注意】

若是“either [neither] of+名词”作主语，则其后的谓语动词可用单数(正式文体)或复数(非正式文体)：

Neither of the two computers is [are] cheap. 这两台电脑都不便宜。 Is [Are] either of the boys ready两个男孩都准备好了吗？

I don’t think either of them is [are] at home. 我想他们俩个都会不在家。 4. each作主语或修饰主语时

单独用作主语(或修饰主语)，谓语用单数:

Each student has his own desk. 每个学生都有自己的课桌。