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Would the proper grammar be "The police has arrived" or "The police have arrived?"
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Anonymous"The police have arrived?"
Police means more than one individual person. It is plural.
http://www.oxforddictionaries.com/us/definition/english/police
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The police have arrived
anonymous Would the proper grammar be "The police has arrived" or "The police have arrived?"

The police have arrived.

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I think "The police have arrived." is correct because when we call over police for help a single police person does'nt reach the place informed by someone.