When deciding between the articles a or an, you should go by the letter, not the sound.

Name: When deciding between the articles a or an, you should go by the letter, not the sound.
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Question

Quizplus · Accepted Answer

The choice between "a" and "an" is determined by the sound that follows it, not necessarily the letter. If the following word starts with a vowel sound, "an" is used; if it starts with a consonant sound, "a" is used.

When Deciding Between the Articles a or An, You Should