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The article 'A' is used before singular, countable nouns that begin with a consonant sound, while the article 'AN' is used before singular, countable nouns that begin with a vowel sound. However, some words may start with a consonant or vowel letter but have an initial sound that differs from the expected pattern.
Select the alternative that uses the article incorrectly.
She has a euro.
Does his name begin with an "F"?
That number is a "1".
She studies at an university.
I only have an hour for lunch.