Countable nouns (form)

1. Countable nouns are used with things that can be quantified

• a book / two books
• one teacher / six teachers

2. Singular countable nouns cannot be used alone; they must have a determiner

• Bring me the book
• You can ask that English teacher
• That's my idea

3. The plural of countable nouns is made by adding '-s', '-es' or '-ies'

• friend / friends
• class / classes (we add '-es' to nouns ending in '–ss', '-ch', '-s', '-sh' and '-x')
• boy / boys (we add '-s' if a noun ends in a vowel + 'y')
• country / countries (we add '-ies' f a noun ends in a consonant + 'y')

4. Some common nouns have irregular plurals

• man / men
• woman / women
• child / children
• foot / feet
• person / people