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1. Unless he takes more care, he'll have an accident.
2. Unless it rains soon, the crops will be ruined.
3. If the weather isn't fine, we'll stay at home.
4. If I don't get my work finished, I can't go with you.
5. Unless you leave on the 15th, you'll get home late for your mother's party.
6. If Tom's father doesn't tell him what to do, he never does anything.
7. Unless you don't really want it, don't take this job.
8. Unless she prepares for the test, she will get bad marks./ Unless she does something to prepare for the test, she will get bad marks.
9. If you don't get a visa, you can't visit the United States.
10. If you don't remember our address, you can find it in the phone book.
Câu đk loại 1 : If S Vs/es, S will/can V
Unless ~ If not