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The Noun Numbers | English Grammar Class 7 PDF Download

Points to be Remembered

  • Only countable nouns have plural forms. Singular countable nouns can be made plural usually by adding the suffix–s or es.
  • Nouns that are made plural by adding–s or es are called regular nouns. For example: table –tables, glass–glasses.
  • However the plural form of some nouns are made differently. Such nouns are called irregular nouns

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

The Noun Numbers | English Grammar Class 7

Singular to Plural using es

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

The Noun Numbers | English Grammar Class 7

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

The Noun Numbers | English Grammar Class 7

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

The Noun Numbers | English Grammar Class 7

Plural of Noun by a change of inside vowels

The Noun Numbers | English Grammar Class 7

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.

  • The jury was unanimous in its opinion.
  • The jury were divided in their opinion.
  • The committee has agreed on this issue.
  • The committee are divided on this issue.
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FAQs on The Noun Numbers - English Grammar Class 7

1. What are prime numbers?
Ans. Prime numbers are natural numbers greater than 1 that can only be divided by 1 and themselves without leaving a remainder. In other words, they have exactly two positive divisors.
2. How do you determine if a number is prime?
Ans. To check if a number is prime, you can divide it by all numbers less than its square root. If none of these divisions yield a whole number quotient, then the number is prime. Otherwise, it is composite.
3. What is the largest prime number known to date?
Ans. As of now, the largest known prime number is 2^82,589,933 - 1, which is a massive number with 24,862,048 digits. It was discovered on December 7, 2018, as part of the Great Internet Mersenne Prime Search (GIMPS) project.
4. Are there infinitely many prime numbers?
Ans. Yes, there are infinitely many prime numbers. This was proven by the ancient Greek mathematician Euclid around 300 BCE. He showed that if you have a finite list of prime numbers and multiply them all together, then add 1 to the product, the resulting number will either be prime or have a prime factor that is not in the original list. This demonstrates that there are always more prime numbers to be found.
5. What is the significance of prime numbers in cryptography?
Ans. Prime numbers play a crucial role in modern cryptography, particularly in asymmetric encryption algorithms like RSA. The security of these algorithms relies on the fact that prime factorization of large numbers is computationally difficult. By using large prime numbers as the basis for encryption keys, it becomes extremely challenging for unauthorized individuals to decrypt the encrypted data without the corresponding private key.
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