Need help in grammar. I am going to have an mid-term exam this week, but i am getting in trouble with recognizing " Dependent Clauses" and " Independent Clauses " in the complex sentences. Can anyone help me? Thanks1) Because Mary and Samantha arrived at the bus station before noon, I did not see them at the station. 2) While he waited at the train station, Joe realized that the train was late. 3) After they left on the bus, Mary and Samantha realized that Joe was waiting at the train station.