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In English grammar, number indicates a word is singular or plural.
In English sentences, subjects and verbs must agree in number. Such agreement is typically called subject-verb agreement. So if the subject is singular, the verb must be singular or if the subject is plural, the verb must be plural.
| Singular Forms for Nouns and Present Tense 3rd Person Verbs | Plural Forms for Nouns and Present Tense 3rd Person Verbs |
|---|---|
| Singular nouns have no –s. | Many nouns become plural by adding -s |
| Singular present tense verbs require the –s. | Plural present tense verbs are pluralized by removing the –s. |
| The boy eats. The girl plays. The baby swims. | The boys eat. The girls play. The babies swim. |