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A, E, I, O and U are vowels.

Vowels are letters that make a sound without the mouth or throat closing.

We would use ‘a’ if the following word began with a consonant.

a dog
a cat
a mouse

We would use ‘an’ if the following word began with a vowel.

an eel
an octopus
an insect

Remember, beware exceptions to the rules.

When deciding whether to use ‘a’ or ‘an’, the decision is made based on the sound of the letter.

an honest mistake
a hippopotamus

The letter ‘h’ makes a different sound in these words, so we choose our article accordingly.

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