Background: In this research we speak about the inflection in English and according to the properties of inflection and derivation, we elicited and described the inflectional affixes in English. According to these properties the inflectional affixes in English were divided to the three groups: 1- inflectional affixes of the nouns : plural(-s) and possessive (-`s). 2- the inflectional affixes of the verb: (-s) in the simple present tense for third person singular , (-ing) for present participle and gerund , (-ed)in the pat tense and (-en) in the past participle.3-inflectional affixes of adjectives: (-er) in comparative form of the adjective and (- est) in superlative form of the adjective. In this research we followed the continuum approach, that said inflection and derivation are continuum, each affix that has more inflectional properties is closer to the inflectional part of the continuum and each of them has more derivational properties is closer to the derivational part of continuum. Our statistical society in this research are 50 native English speakers who live in Iran. They were selected through the Simple Random. After that information were analyzed through the Descriptive method. A the result we found that according to the properties of the inflection and derivation, this affixes have the most inflectional properties in English .therefore, we can say that English has 8 inflectional affixes that all of them are suffixes.
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