For learners, memorizing vocabulary and using vocabulary correctly is a big obstacle to learning English. However, most of the words in English are composed of affixes and roots. Therefore, if you understand the frequently appearing affixes and roots and master their usage, you will get twice the result with half the effort. Therefore, learners need to fully understand the characteristics of these negative prefixes, make full use of the rules of word formation, and master the common root affixes of a group of words to achieve the purpose of string word memory, so as to improve the efficiency of memorizing words and improve the level of learning English. This paper makes a simple comparison between the negative prefixes un - and dis - in terms of semantics and word formation.<br>
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