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The noun "grass" can be both countable and uncountable.

grass → uncountable

Meaning: a common plant that's eaten by horses, cows, sheep, etc.

Example sentence: The longest grass on a golf course is in the rough, and the shortest grass is on the greens.

grass → countable

Meaning: any particular type of grass

Example sentence: A number of different grasses are used to make the surface of a tennis court at Wimbledon.

Quick Quiz:

In which sentence is the word "grass" uncountable?

a. Has your husband cut the grass in your front yard yet?

b. Does he know how to trim your ornamental grasses?

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Contributor: Matt Errey