Viết theo cấu trúc Unless – If... not
Ví dụ:
Unless it rains tomorrow, we will go on a picnic.
If it does not rain tomorrow, we will go on a picnic.
Bài tập:
1. If you can’t swim, you’re not allowed in the deep end.
You’re not
2. If I finish my homework, I can go out at the weekend.
I can’t go out
3. World population will continue to rise if we do not try to reduce it.
Unless
4. Unless we leave now, we’ll miss our ride home.
If
5. Unless there is water, this tree won’t grow.
If
6. If you don’t rest, you will be ill.
Unless
7. Unless you keep your feet dry, you will catch a cold.
If
8. If she is late, we won’t be able to take that flight.
Unless
9. She will go with him if he promises to keep secret.
She won’t go
10. If they don’t study hard, they will fail the exam.
Unless