Составьте 5 предложений с if и 5 предложений c Unless

1. If they don't learn all the grammar rules, they will not write the test.

2. Unless they learn all the grammar rules they will not write the test.

3. If he doesn't come in time, we will not catch the train.

4. Unless he comes in time, we will not catch the train.

5. She will go to the office if her sister comes in time.

6. They will not speak English unless they communicate with the foreigners.

7. I will invite them if I have much time.

8. I will buy this book unless I earn much money.

9. If we visit them, we will be very glad.

10. Unless they leave the city, they will not see them.