free, for free, free of charge
The expression for free is informal and should not be used in writing.
- Informal: I hope we can see the show for free this time.
In formal writing, use simply free—or, for emphasis or clarity, use the expressions free of charge or at no cost.
- Elise provides translation services free to non-profit organizations.
- He’d play free of charge (or at no cost) for a good cause.
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A tool created and made available online by the Translation Bureau, Public Services and Procurement Canada