Here’s a pair of context clues worksheets that should go out together: the first on the verb certify and the second on the noun certificate.
Certify is used only transitively. It carries a variety of meanings, but for the context in which this worksheet embeds the verb, , it means “to attest authoritatively,” “confirm,” and “to attest as being true or as represented or as meeting a standard.” A certificate is what one receives when the definition of certify has been met in practice.
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Mark's Text Terminal 