What is singular?
A singular noun names one person, place, thing, or idea.(एकवचन)
Boy लड़का, girl लड़की, tree पेड़, bus बस, car गाड़ी, knife चाक़ू, dog कुत्ता, school पाठशाला, mother माँ, sister बहन, flower फूल, rose गुलाब, box डिब्बा
What is plural?
A plural noun names more than one person, place, thing, or idea.
Boys लड़के, girls लड़कियाँ, trees पेड़, buses बसें, cars गाड़ियाँ, knives चाक़ू, dogs कुत्ते, schools पाठशालाएँ, mothers माएँ, sisters बहनें, flowers फूल, roses गुलाब, boxes डिब्बे
Singular (एकवचन) को plural (बहुवचन) में बदलने के नियम
Singular Noun Definition: When a noun means one only, it is said to be singular.
Examples: boy, girl, book, church, box

Plural Noun Definition: When a noun means more than one, it is said to be
plural. Examples: boys, girls, books, churches

Rule #1
The plural of nouns is usually formed by adding s to a singular noun.
Example: lamp, lamps; cat, cats; fork, forks; flower, flowers; pen, pens

Rule #2
Nouns ending in s, z, x, sh, and ch form the plural by adding es.
Example: moss, mosses buzz, buzzes box, boxes
dish, dishes church, churches

Special Note:
If you add s to such nouns as fox, bush, and bench, you will find that you cannot
pronounce them without making an additional syllable. This is why such nouns
form the plural by adding es.

Rule #3
Nouns ending in y preceded by a consonant is formed into a plural by changing
y to ies. Examples: lady, ladies; city, cities; army, armies

Rule #4
Nouns ending in y preceded by a vowel form their plurals by adding s.
Example: boy, boys; day, days

Rule #5
Most nouns ending in o preceded by a consonant is formed into a plural by
adding es. Example: hero; heroes; grotto, grottoes

Rule #6
Some nouns ending in f or fe are made plural by changing f or fe to ves.
Example: beef, beeves; wife, wives