Probably because you was originally the plural form (used when talking to more than one person), while the singular form was thou . Thou is not normally used now, and you is used for both singular and plural.
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Anonymous why 'are ' is use with you(single person) not is?Why is 'are', not' 'is', used for singular 'you'?
Anonymous why 'are ' is use with you(single person) not is?For purposes of verb agreement "you" is always treated as plural. It doesn't matter how many people you're talking to.