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We use article "a" before singular nouns or adjectives that start from a consonant (B, F, D, etc.).

Examples: a book, a black pencil.

We use article "an" before singular nouns or adjectives that start from a vowel (A, E, O, etc.).

Examples: an egg, an old car.

I'm Tim. I'm a schoolboy. My favourite subject is Geography. I like it because we have a good teacher. She tells us a lot of interesting facts. I need to take my Geography book, a notebook and an atlas to the class. I also take my pencil case with a blue pen, a pencil, a long ruler and an eraser in it.

We use "a" before

• singular countable nouns (e.g. schoolboy, pen)
• plural nouns (e.g. facts, subjects)
• a vowel
• a consonant

We use "an" before

• singular countable nouns (e.g. eraser)
• plural nouns (e.g. facts, subjects)
• a vowel
• a consonant

We put "a"/"an"

• before a noun only
• before an adjective only
• before an adjective and a noun