Exercise 1: Kết hợp câu dùng câu điều kiện 1. He can't go out because he has to study for his exam. → If ................................................................................................................................................................ 2. She is lazy so she can't pass the exam. → If ................................................................................................................................................................. 3. He smokes too much; that's why he can't get rid of his cough. → If ................................................................................................................................................................ 4. I can't play football this afternoon because I felt tired. → If ................................................................................................................................................................. 5. Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from the highway. → If ................................................................................................................................................................. 6. She can't be employed because she doesn't have a college degree. → If ................................................................................................................................................................. 7. She walked to the meeting. She was late. → If ................................................................................................................................................................ 8. Unless you promise to return back, I won't lend you. → If ................................................................................................................................................................ 9. We put off our trip because the weather was terrible. → If ................................................................................................................................................................ 10. Sally doesn't know what she has to do for homework because she was absent from school on Friday. → If .................................................................................................................................................................