They don't understand the problem. They won't find a solution​

1. They don't understand the problem. They won't find a solution​
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2. Go right now or you'll be late for the train.
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3. Because you speak English unnaturally, they do not understand you.
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4. We didn't know your phone number, so wee could not contact you.
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5. Because Simon doesn't live near his mother, he can't visit her often.
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6. She didn't hurry, so she missed the train.
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7. John is fat because he eats so many chips.
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8. Bill never does anything if you don't tell him what to do.
=> Unless .............................
9.They don't have enough time so they cannot do me a favour.
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10. I must leave now, or I'll miss the flight.
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11. Hurry up, or we will be late for the exam.
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12. Peter gets bad marks because he doesn't prepare his lesson well.
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13. He doesn't apply for the job because he doesn't have enough qualifications.
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14. We can't buy this car because it is very expensive.
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15. Unless he phones her immediately, he won't get any information.
=> If ...............