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79 Chapter 17. Roots: Describing Like the action words presented in Lesson 16, some words that describe people, places, and things have their basis in roots borrowed from Latin and Greek. In this lesson, you will learn to recognize and use roots related to describing time, change, being sure, truth, and finality. -cert- What do the words containing the root -cert- in the following sentences mean? · · · · · I am certain that he is mistaken. I certify that this is correct. Please send a certified check to pay that invoice. We need a copy of your birth certificate. Please ascertain the whereabouts of the suspect on June 3.