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140  The Journal of the Royal Institute of Thailand Volume IV - 2012 The suf fi xes that are added in noun plural in fl ections in English are as follows: -s, -es, -ves, -ies, -en, -ren, –ee, -e, and –i. There are also Greek and Latin suf fi xes -a, -e, -es, –ices and –i and a zero suf fi xed plural included. This indicates that noun in fl ection for plural in English is not a simple process but one that requires a broad knowledge of numerous environments and irregular in fl ectional af fi xes. The options for noun plural in fl ection are much more complicated than simply adding –s to the end of a noun. In fl ection for noun possessives also has numerous variations for the use of –’s. These include: 1) Singular nouns with -’s, 2) Plural nouns without -s af fi x 3) Two owners with one thing 4) Noun phrases 5) Names of some places 6) Nouns telling time. 7) Nouns telling distance 8) Nouns telling monetary value 9) Nouns telling weight. For S apostrophe (-s’), they are: Plural nouns without -s af fi x, 3) Either –’s or –s’ af fi xes: Speci fi c nouns ending with –s. This category of in fl ection also includes possessive suf fi x-’s in plural of numbers: 1) Plural of letters, numbers or words 2) Plural of abbreviations and 3) Decades. This also indicates that noun in fl ection in possessive form in English is also not a simple process, but one that requires a broad knowledge of the environments in which–’s and–s’ can occur. According to Conway (1998), he discussed the problem of English plurals, claimed that even at the lexical level, it can be a complex matter to correctly in fl ect the individual words of a sentence to re fl ect their number, person, mood, case, etc. However, Wagner (2008), posed questions regarding teaching morphemes in a certain order, asking if it should be broadened to include other factors, for example, should teachers focus on the morphemes on which students make the most mistakes; should teachers focus on the most frequently used morphemes and disregard acquisition order altogether and should teachers focus less on grammatical morphemes and more on communicative ability. The options for noun possessive in fl ection are more varied than simply adding –’s or –s’ to the end of a noun. In fl ections in English Nouns, Verbs, and Adjectives