ABSTRACT Dian Fajariyah Damayanti, 2019. The Effect of Think Pair Share Technique on Eleventh Graders Grammar Mastery at Ma Miftahut Thullab Kedungdung Sampang. Thesis, English Teaching Learning Program (TBI).Tarbiyah Faculty, State Islamic Institute (IAIN) of Madura. Advisor : Mulyadi, S.S., M.Pd Keywords: Think Pair Share Technique, Grammar Mastery Grammar is partly the study of wh…