If so, my analysis amounts to a rule in search of actual usage—a prescription rather than a description For example, you might receive a voucher through the mail that says you are entitled to a free drink if you hand the voucher in at a bar. Confusingly, in the uk, they are known as public schools.
I don't think there's any difference in meaning, although free of charges is much less common than free of charge If something is free it is without charge Regarding your second question about context
6 for free is an informal phrase used to mean without cost or payment. these professionals were giving their time for free You should not use it where you are supposed to only use a formal sentence, but that doesn't make a phrase not correct. What is the opposite of free as in free of charge (when we speak about prices) We can add not for negation, but i am looking for a single word.
For example, imagine some food company decides to make their fruits permanently free Them (for free), but in person, what do you do What would be the professiona. 8 free and on the house both mean that you don't have to pay, but the inferred meaning is slightly different
