Rule 1 : Some nouns have the same singular and plural forms. Then how do we distinguish between singular and plural? Singular nouns have ‘is/ was/ has’ as the helping verb, and the plural nouns have ‘are/ have/ were/ are’ as the helping verb.
Ex : Deer —-> Deer / Gross —-> Gross
Rule 2 : Some nouns can be written only in the plural form and should use a plural verb after the noun.
Ex : Spectacles / Scissors / Trousers
Rule 3 : Some singular nouns have plural forms but we should write them with singular verb after them.
Ex : Innings / Mathematics / News
Rule 4 : Abstract nouns have no plural form. For example,
Ex : Kindness / Happiness / Hope