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3. If you don't put on your overcoat, you'll be cold.
.....
4. You will fail the exam if you don't work hard.
5. You'll get a cold if you don't keep your feet dry.
6. If I don't leave now, I'll miss my flight.
7. If you aren't going to the party, I won't go.
8. I can't send you a postcard if you don't give me your address.
9. If I won a big prize in a lottery, l'd build a school for the poor.
10. I'll call the police if you don't leave me alone.