The result of this study found that the students made mistakes in using subordinate conjunction. The kinds of subordinate conjunction that were used incorrectly are that, because, where, event though, when, so, although, besides, that and event though.
This thesis research about the ability and the difficulties of the third semester students at english and Literature departement of adab and humanities faculty in mastery the using WH-form as interrogative form and as conjuction such as what, who/whom, where, why, which, and how.