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Unit 6.1

Invariant Plural Nouns

Nouns

Nouns refer to a person, place, thing, event, substance or quality {see Nouns, A1 Level}.

Invariant nouns are nouns which have the same singular and plural form.

Invariant nouns don’t follow the general plural formation rule, they are the same in singular and plural. When the noun has both singular and plural form the article is adapted to it, but if it has just a singular form, we don´t add -s in the end of the noun.

The most commonly used invariant plural nouns are: scissors, series, goggles, jeans, trousers

Adding a pair of before the noun make these nouns singular, because we start to refer to them as one single entity.

  • Singular form of the invariant nouns
    • A pair of scissors is on the office desk.
    • This advertisement is about a new series.
    • Your old pair of goggles is used in the musical.
  • Plural form of the invariant nouns
    • Scissors are dangerous for babies.
    • New TV series about famous writers are going to start.
    • These goggles cost a fortune!
The invariant plural nouns are used in the same way as plural nouns.

Invariant nouns are nouns with same singular and plural forms, and we need to use the correct article to distinguish them. They don’t follow the general plural formation rule.

The most commonly used are: scissors, series, goggles, jeans, trousers

For example:
— “I bought a pair of jeans.” / “I bought two pairs of jeans.” = We use the same word for singular and plural.

Let’s revise this content within the {Form} section. Take a look at the {Example} section that shows its use within a context.

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