 They are a type of bound formative encoding a grammatical constructor associated with a specific word class.The position in which the affix is placed in a word changes its classification to either a prefix, which is before the base morpheme, or a suffix, which is after the base morpheme.In example "4a" provided by Facundes (137, 2000), ‘"wako-ru’" is a plural suffix and is after the base morpheme ‘"kuku’," 'man'.