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Youll need to complete a few actions and gain 15 reputation points before being able to upvote. · 6 for free is an informal phrase used to mean without cost or payment. these professionals were … · if so, my analysis amounts to a rule in search of actual usage—a prescription rather than a description. Upvoting indicates when … On ~ afternoon implies … · what is the opposite of free as in free of charge (when we speak about prices)? We can add not for negation, but … · the choice of prepositions depends upon the temporal context in which youre speaking.