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136  The Journal of the Royal Institute of Thailand Volume IV - 2012 In fl ections in English Nouns, Verbs, and Adjectives Introduction In recent years, in fl ection in a language is signi fi cant because it can convey information regarding tense, agreement, person, number or aspect, and other details. But, despite its signi fi cance, it is often omitted or incorrectly substituted. The omission of in fl ection could be expected in usage by second language (L2) learners or agrammatic users when exposed to a highly in fl ectional language with rich verbal paradigms, where multiple verb forms compete for the learner’s or user’s attention and overwhelm the processing system. English, with its residual in fl ectional paradigm, should not be as challenging (Szupica-Pyrzanowski, 2009). Purpose of the Study To achieve the goals of the study, the purposes of the study are to: 1. analyse in fl ection in nouns, 2. analyse in fl ection in verbs, and 3. analyse in fl ection in adjectives. Signi fi cance of the Study This research study of in fl ection in English nouns, verbs and adjectives is signi fi cant in terms of the pedagogy of developing the students’ level of ability in linguistic competency, but research related to in fl ection in the study of foreign languages has rarely been conducted into the analysis of English language in fl ection in Thailand. In particular, when selecting foreign language programmes, universities often simply choose the programs and teaching methods that are popular in other Asian countries, or in the USA. It is believed that this research study delivers rich and useful data, which will give a broader idea of the usage of in fl ection in the English language. Also, it will also be bene fi cial for educators, educational systems and international research as the fi ndings can be advantageous to the educational system in neighbouring countries such as Myanmar, Laos, Vietnam and Cambodia where the cultural factors and languages are similar to Thailand. Understanding the system of in fl ection as used in the English language will further contribute to the improvement of educational development in the region of Southeast Asia and beyond.