Question

I.             III. Complete the exercise with If or Unless.
1. We cannot go sailing _______ the rain stops.
2. I won't talk to her _______ she apologizes to me.
3. You won't be able to find the house ________ you get help from your GPS.
4. I won't go _______ he is going.
5. _________ we don’t take the necessary measures now, we may have serious
problems later.
6. _________ you don't take notes you will have hard time studying later.
7. She must have graduated already ________ she failed a class.
8. Jason is always cheerful _________ something really bad happens.
9. I will never forgive you _______ you tell him the truth.
10. You are not allowed into the casino _______ you are under 21 years old.
11. My mother will cook ________ they decide to eat out.
12. I should be there by 11 o'clock ________ I don't catch any traffic.

13. I should be there by 11 o'clock _______ I catch a lot of traffic.

14. The show should start at 9:30 ________ they changed the schedule.

15. ________ they behave well, those children are not welcomed here.

Answer 1

1. unless
2. unless
3. unless
4. if / unless 
5. If
6. unless
7. unless
8. unless
9. if / unless 
10. if
11. if
12. unless
13. unless
14. unless
15. unless

Answer 2

Đáp án:1.Unless

             2.Unless

             3.Unless

             4.If

             5.If

             6.Unless

             7.Unless

             8.Unless

             9.If

             10.If

              11.If

              12.Unless

              13.Unless

              14.Unless

              15.Unless.