<![CDATA[This research described the rules of morphology in the text of President Barack Obama's speech on the title Education in 2009. The purpose of this study were (1) to identify the types of derivational affixes in President Barack Obama's speech. (2) to find out the function of using the derivational suffix contained in President Barack Obama's speech. This study used qualitative research methods. The object of this study was the text of President Barack Obama's speech. The speech was analyzed using Fussel's theory, it's Affective Derivational. The Fusell's derivational augmentation theory is divided into 2 types, namely: Prefix and Suffix. Whereas the affixes derivational affix functions used Brinton's theory. The findings of this study were: there are two types of derivational affixes, namely: prefix and suffix . The prefixes found in speech were (a-), (dis-), (de-), (re-), (over-) while suffixes are -able, -ing, -ly, -er, -ant, -ion , -ity, -ive, -or, -ment, -al, -ness, -ed, -ate, -hood, -en, -y, -shi, -full. In this study, the derivational affix function found two functions, namely: class change (60) and meaning change (11). ]]>
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