Rewrite the sentence with "if" 9.They didn’t sell the house because their children wanted to keep it 10.Mrs. White fell down because she was too weak. 11.He failed because he didn’t do the exams well. 12.She couldn’t come because she had to work overtime. 13.He couldn’t hear you well because you spoke so softly. 14.I couldn’t answer the phone because I was having a bath. 15.He doesn’t have the money and he cannot afford a new car.