A suffix typically determines the word's part of speech. While prefixes can modify a word's meaning, it is generally the suffix that indicates whether the word is a noun, adjective, verb, etc.
As you learned in the PowerPoint video, prefixes and suffixes are called affixes. You can remember this if you understand the meaning of the word "affix"; before you drop an envelope into the mail, you affix a stamp to the upper righthand corner. Both prefixes and suffixes change the meanings of words, but only one of them typically determines the word's part of speech, making it a noun, adjective, verb, etc. Which one--a prefix or a suffix--determines the word's part of speech?
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