Luyện ngữ pháp - Destination C1 and C2 (Unit 21: Grammar - Noun phrases))
• We use a before a consonant sound, and an before a vowel sound. It is the sound and not the spelling that is important (eg a unique experience, an umbrella).
• We use a/an to show what group someone or something belongs to, or to classify it/him/her. ✓ Liz is a modernist.
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