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135  The Journal of the Royal Institute of Thailand Volume IV - 2012 In fl ections in English Nouns, Verbs, and Adjectives Suwaree Yordchim 1 Suwaree Yordchim Abstract The objectives of the study are to analyse in fl ections as they occur in the English language in nouns, verbs and adjectives, including both regular and irregular forms, in order to quantify how many types of variations there are and to determine what these variations are. The instrumentation of the study comprises of a content analysis of in fl ections in English that yields an 8-point framework of the in fl ection of nouns, verbs and adjectives: 1. plural nouns, 2. possessive nouns, 3. present verb third-person singulars, 4. present participle verbs, 5. past tense verbs, 6. past participle verbs, 7. comparative adjectives, and 8. superlative adjectives. Checklists were then derived from this framework and fi lled by data collection of lexical units from a variety of sources. The data obtained was then analysed with a focus on suf fi x morphemes. Useful fi ndings include a complete inventory of in fl ectional variation and irregularities that reveal the true complexity of this grammatical component of the English language. Insights regarding these in fl ectional variations and irregularities are offered to encourage deeper understanding and improvement of English skills as a foreign language in Thailand for both teachers and serious students of English. Keywords: English In fl ection, Noun, Verb, Adjective 1 Ph.D. in TESOL and Applied Linguistics Dissertation Advisors: Prof. Dr. Udom Warotamasikkhadit Assoc. Prof. Dr. Ponlasit Noochoochai Dr. Cholthicha Sudmuk