This isn't about grammar - it's about phonology. The basic rule is extremely simple: we use 'a' when the following word begins with a consonant sound, and we use 'an' when the following word begins with a vowel sound. Note that this is about SOUNDS, not spelling. In most cases, we pronounce the 'h' at the beginning of words. This is a consonant sound, so we use 'a'. For example: a hat a house a hamburger However, there are a few words beginning with 'h' where the 'h' is silent. Words which have a silent 'h' begin with a vowel sound, so they are preceded by the article 'an'. The most important of these words is 'hour', which is pronounced exactly the same as 'our' - as if the 'h' were not there. The word 'honour' (spelt 'honor' in American English) also has a silent 'h'. Here are some examples: an hour an hourly service an honour an honest man There are also a few words where the 'h' is sometimes pronounced and sometimes not: a hotel ( usual in modern English) an hotel (formal/outdated English) an historic moment (rather formal and old-fashioned) a historic moment (acceptable in modern English) an herb (only in American English) a herb (elsewhere in the English-speaking world) I hope that helps.

Hey! I will. In the example of 'an hour', you don't pronounce [h] sound in the word, cuz' it's silent, so basically it starts with [a]. To make it easier you should write and pronounce 'an hour'. Instead in 'a hotel' you do pronounce [h], so if a word starts with a consonant you need the article 'a'. Hope I've helped you.

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