What is the rule for using 'a' or 'an' before words starting with 'w'?

Use Of The A And An Questions

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What is the rule for using 'a' or 'an' before words starting with 'w'?

The rule for using 'a' or 'an' before words starting with 'w' is to use 'an' before words starting with a silent 'w' sound, such as 'an hour' or 'an honest person'. Use 'a' before words starting with a pronounced 'w' sound, such as 'a wolf' or 'a watermelon'.