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I have a sentence. Can you check if the underlined word can function without an article? Is the sentence O.K.? The dictionary says it is both a mass noun and singular noun but has no mention of it being an uncountable noun.

What color is grass? Green
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Yes, it's fine that way, when referring to the overall concept of "grass."

If you want to talk about the grass in your own front yard - a particular bit of grass - you use an article. "My grass is so brown." Or "Now that I fertilze, the grass in my yard is so green." You cannot say "a grass," though you can say "a blade of grass" which would refer to a single stalk of grass.
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It sounds OK to me. You're talking about grass in general. Then you can say: "I shouldn't have mown the grass this morning", meaning "the grass that grows in my garden.
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Comments  
Thank you, Pienne and GG.

Can anyone give me some more simple examples of the case of a term being used generally and that being OK without the article? Help me to get the concept?? clearly.
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Cows go moo.

Footballers get paid too much.

Politicians never tell the truth.

Translators always see two sides of a story.

:-)

It's got nothing to do with countables, whenever we use a noun in general, the article isn't used.