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。 扩展资料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：grassedgrass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
