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139  The Journal of the Royal Institute of Thailand Volume IV - 2012 Learner’s Dictionary, the Merriam-Webster Dictionary, the Longman Dictionary of Contemporary English and the Collins Cobuild Dictionary and Rhyming Dictionary. 2) The next step was sorting the cases, and putting the same variants together. The vocabulary chosen according to the following criteria: a) nouns - they must have plural forms, such as in in fl ectional environments, both at word level and compound level. b) verbs - all verbs were included in the analysis. c) adjectives - irregular forms were focused on. Lexicons and parts of speech were considered while they were collected from the various dictionaries. Words with pre fi xes were eliminated and only the simplest form was chosen, for example, between write and rewrite , the word write was chosen. Then, each type of environment and the suf fi xal occurrences were explained. 3) Finally, analysis of the phenomenon in each category in noun, verb and adjective in fl ection was conducted and conclusions were drawn from the data. Results of this study Findings related to noun in fl ection Noun in fl ections occur in the following environments: 1) Nouns ending with –f, -fe, -ff, -ffe, -gh and –ph, 2) Nouns ending with –o, -oo, -oe, -ou -ow, and –eau, 3) Nouns ending with –y.-ay, -ey, -oy, and –uy, 4) Nouns ending with –th, 5) Nouns having suf fi xes –en and –ren, 6) Nouns with suf fi xes –ee, -e, and –i, 7) Nouns with a zero suf fi xal plural , 8) Nouns with Greek and Latin suf fi xes -a, -e, -es, –ces and –i, 9) Compound nouns with different forms of af fi xes, and 10) Nouns with multiple plural forms. The pronunciation of suf fi x –s is affected by voiced, voiceless and sibilant phonemes of the fi nal consonant and by fi nal vowels sounds, all of which are voiced. Some of them are in fl ected within the word, such as in man - men and woman - women . A few of them are in fl ected by a zero suf fi xed plural with no change occurring either within or at the end of the word, such as fi sh - fi sh . Some nouns ending with –e will retain a silent –e when in fl ected for plural form, such as note – notes ; while others will have the –e pronounced, such as bridge - bridges . Suwaree Yordchim