Memory Game Prefix, Suffix & Root MatchOnline version Learn how prefixes, suffixes, and roots modify meaning. by Xadicha Abdusattorova -ed -ing spect -er Suffix for a person or thing that performs Root meaning: to do or perform. Present participle; ongoing action. Root meaning: to look or see. Again or back; repeat action. act Negation; opposite of the base word. un- -ly Past tense; action completed. re- Suffix turning adjectives into adverbs.