Hello, I'm an English language expert with a strong focus on grammar and usage. When it comes to using articles in English, it's important to consider the sound that follows the article.

The word "hour" starts with a silent 'h' and the pronunciation begins with a vowel sound, "our." Therefore, the correct article to use before "hour" is "an."

So the sentence should read: "An hour."

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The initial sound of hour is /a?/, a vowel (well, actually, a diphthong), and not the consonant /h/. Hour is pronounced the same way as our - we say the h is unaspirated. The 'rule' is to use an rather than a before a word beginning with a vowel sound.read more >>