Improving Students' Vocabulary in Writing Sentences Through Teaching Affixes

Most of grade X students of SMA 2 Sawahlunto were not able to write sentence in English well. They had lack of vocabularies and difficulties in orming noun, adjective, verb and adverb which are related to prefix and suffix. The students did not have a lot of vocabulary; consequently they were not able to write sentences well. This phenomenon was interesting to be investigated and found the problem solving. The purpose of this research is to explain and disclose to what extent teaching affixes can improve students’ vocabulary in writing sentences at grade X students of SMA 2 Sawahlunto. The second one is to describe and explain that factors influences the students’ vocabulary in writing sentences at grade X students of SMA 2 Sawahlunto. Get more information from the students. This research was classified into classroom action research. The data were collected through observation, test, and interview. Then collecting data was used to gett more information from the students. The researcher found out that most of the students faced some problems in writing sentences because they could not determine noun, adjective, verb and adverb which are formed by prefix and suffix as a result they had lack of vocabulary and they had difficulties in expressing their sentences. The second problem related to students’ ability to form noun, adjective, verb and adverb because they did not recognize the prefix and suffix well. These problems were caused by the teacher’s strategy in teaching vocabulary. The students were not taught how about word formation. The research findings have answered the research questions that teaching affixes could improve students’ vocabulary in writing sentences at grade X students of SMA 2 Sawahlunto.