Exercise 5: Use UNLESS instead of IF.
1. If you do not study hard, you will fail the exam.
2. If you do not like this one, I will bring you another.
3. If she does not hurry, she will be late.
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4. If you are not careful, you will cut yourself.
5. If you had not sneezed, he would not have known that we were there.
6. If you do not work harder, you will be sacked because of your laziness.
7. If there had not been the heavy storm, the climbers will not have died.
8. She has found that nobody can help her if she did not try her best to do it herself.
9. If you don't know how to spell a word, you should look it up in the dictionary.
10. The campfire would have been cancelled if it hadn't rained last night.