As a sign of my regard, I want to present you with a [complementary] copy of my book.
As a sign of my regard, I want to present you with a [complimentary] copy of my book.
Take care in using these frequently confused words.
To complement means “to be compatible” or “to complete”; complementary means “compatible.”
To compliment means “to praise;” complimentary means “given free as a courtesy.”
Remember: I praise you with an i.
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See Error Checklist for a compilation of 75 common writing errors.
For more exercises in identifying common errors,
take the M.B.A. exam and the Punctuation and Grammar Challenges.