Suffix and prefix are very important for English second paper. These enrich English grammar skill. Prefixes and suffixes are super useful for customizing the meanings of words, but what are they? A prefix is a group of letters (or an affix) that’s added to the beginning of a word, and a suffix is an affix that’s added to the end of a word. Prefixes modify the meaning of a word. They can make a word negative, show repetition, or indicate opinion. Some suffixes add to or change a word’s meaning. Others can signal the word’s part of speech or indicate verb tense.