Examples:
* cat - cats
* dog - dogs
* book - books
* table - tables
However, there are a few exceptions to this rule:
* Nouns ending in -s, -x, -ch, -sh, or -z: Add -es to the singular form.
* bus - buses
* box - boxes
* church - churches
* dish - dishes
* quiz - quizzes
* Nouns ending in -y preceded by a consonant: Change the -y to -ies.
* baby - babies
* city - cities
* story - stories
* Nouns ending in -f or -fe: Change the -f or -fe to -ves.
* knife - knives
* wife - wives
* wolf - wolves
* Irregular nouns: These nouns have irregular plural forms.
* child - children
* man - men
* woman - women
* tooth - teeth
* mouse - mice
Remember: There are also some nouns that have the same form in singular and plural, such as sheep, deer, and fish.