grass既是可数名词也是不可数名词，grass（不可数名词）：草，草地；grasses表示多种类的草；grass（可数名词）：告密者，揭发者。grass作草、草地、牧场解时多用作不可数名词，而作“禾本科植物”解时多用作可数名词。

grass用法

n.草，青草，草地，草坪，告密者，〈俚〉龙须菜

vt.用草覆盖，使…长满草，使…吃草

vi.渐渐被草覆盖，放牧

变形：过去式:grassed；现在分词：grassing；过去分词：grassed

grass用作名词的用法例句

The grass was wet with dew.

草被露水打湿了。

Father was cutting the grass, and meanwhile mother was planting roses.

父亲在剪草,母亲在种玫瑰。

We play football on the grass.

我们在草地上踢足球。

I let the horse drop his head to crop the spring grass.

我让马低下头啃吃春天的青草。

The windows overlooked a lawn of tall waving grass.

窗户外边是一块草地，高高的草随风摇摆。

Mr Zuma had a solid reputation as a grass roots organiser.

作为一个民众的组织者，祖玛先生名声甚佳。