The number denotes whether we speak of one person or one object or
more than that number.
There are two numbers :
A noun that denotes one person or thing is called the singular number.
Examples: River, Man, Boy, Chair, City, Pencil, etc.
A noun that denotes more than one person or thing is called plural number.
Rules for making plurals
Examples: Rivers, Boys, Girl, Books, Pencils, etc.
The plural of nouns is generally formed by adding 's' to the singular; as,
Boy becomes boys.
Tree becomes trees.
Bird becomes birds.
Most nouns ending in 'o' also form the plural by adding 'es' to the singular; as,
Mango becomes mangoes.
Hero becomes heroes.
Buffalo becomes buffaloes.
A few nouns form their plural by changing internal vowels; as,
Foot becomes feet.
Mouse becomes mice.
Tooth becomes teeth.
Some nouns take 'en' after them to form plural; as,
Ox becomes oxen.
Child becomes children.
Brother becomes brethren.
While nouns ending in 's', 'sh', 'ch' or 'x' form plural by adding 'es' to the singular; as,
Bus becomes buses.
Bush becomes bushes.
Bench becomes benches.
Box becomes boxes.
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Parts of Speech