The river teems with all kinds of fish in summer

问题描述:

The river teems with all kinds of fish in summer
These woods are frequented by all kinds of birds
两句句子,都是ALL KINDS OF,但是为什么一个是加单数一个加复数
……

all kinds of后可接可数名词复数和不可数名词
fish在指‘活的鱼’时,单复数同形,指‘吃的鱼’时,为单数.这里为前者.而bird为可数名词,当然为复数.