each of them和all of them的区别

each of them"是指他们中的每一个,谓语也相应的用单数

"all of them"是指他们中的所有,谓语则相应的用复数

例如

The teacher assigned each of them a holiday task.

Not all of them were acting out of self-interest.

他们当中并非所有人的行动都是出于利己的目的。