4.Some nouns have the same form in the singular and the plural. Singular Plural sheep sheep fish fish species species aircraft aircraft 5. Some nouns have a plural form but take a singular verb. Athletics is good for young people. Linguistics is the study of language.
Some nouns have a plural form and take a plural verb.
My trousers are too tight. Her jeans are black. For things we can count. They usually have a singular and plural form. For the things that we do not usually count.