Points to be Remembered
The Plural of a Noun formed by adding s to the Singular

Singular to Plural using es
Singular Nouns ending in s, ss, sh, ch, x or z become Plural by adding es to them.

If a Singular Noun ends in y with a vowel before it, the plural is formed by adding s only.

If a Singular Noun ends in o with a consonant before o, the plural is formed by adding es.

Plural of Noun by a change of inside vowels

Nouns used only in singular
abuse, advice, luggage, machinery, money, poetry, jewellery, scenery, vacation, word, furniture, fruit, meal, fun, freedom, music, joy, permission, progress, rice, wheat, bread, milk, butter, glass, silver, gold, education, homework, employment, etc.
Nouns used as both the numbers, the singular and the plural
Committee, govt, police, wages, jury, means, politics, pains, publics etc.
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| 1. What are prime numbers? | ![]() |
| 2. How do you determine if a number is prime? | ![]() |
| 3. What is the largest prime number known to date? | ![]() |
| 4. Are there infinitely many prime numbers? | ![]() |
| 5. What is the significance of prime numbers in cryptography? | ![]() |