Singular and plural

In english, the plural is often formed by adding “s” to the singular form.
Examples:

Singular Plural
lesson
book
car
lessons
books
cars

But there are cases where we add more than “s”, for example:
For the words ending by Consonant+y, we substitute Y by IES.

Singular Plural
City
Cherry
Lady
cities
cherries
ladies

For the words ending by X, CH or SH, we add ES.

Singular Plural
Church
Sandwich
Box
churches
sanwiches
boxes

For the words ending by F or FE, we substitute F/FE by VES.

Singular Plural
Thief
Knife
Wife
thieves
knives
wives

For the words ending by Consonant+O, we add ES.

Singular Plural
Tomato
Potato
Volcano
Tomatoes
Potatoes
Volcanoes

In addition to these forms of plural, there are irregular forms:

Singular Plural
Man
Woman
Mouse
Foot
Tooth
Ox
Child
Men
Women
Mice
Feet
Teeth
Oxen
Children

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