A and an
- a – before a consonant sound: a book, a cat.
- an – before a vowel sound: an apple, an egg.
The
- the – one special thing both know: the sun, the teacher.
Key idea
Use 'a' before consonant sounds, 'an' before vowel sounds, and 'the' for a special known thing.
Remember
Use 'an' before a, e, i, o, u sounds.