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It was found out that the students have difficulties in differentiating English inflectional morpheme, that is suffix /-es/ and /-s/, to indicate tense for verbs, and plurality for nouns. Other inflectional suffix to mention is /-ing/, /-ed/, /-d/, /-er/, and /-est/. The objective of this study is to improve students comprehension on inflectional affixation as one of word formation processes by implementing drill technique that is extended drill, or substitution drill. The drill was supported with practicing inductive and deductive approach. The drill and the approach were administered during two cycles of classroom action research. The participant of the research was 86 students taking the subject of Introduction to English Linguistics. This study found out that the students comprehension on inflectional affixation of word formation improved gradually from cycle 1 to cycle 2 because of the implementation of the substitution drill that alternately practicing inductive and deductive approach.
Eusabinus Bunau (Tue,) studied this question.