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

If they understood the problem, they would/ could find a solution.

2. Go right now or you'll be late for the train.

If you don't go right now, you'll be late for the train.

3. Because you speak English unnaturally, they do not understand you.

If you didn't speak English unnaturally, they would/ could understand you.

4. We didn't know your phone number, so we could not contact you.

If we had known your phone number, we could have contacted you.

5. Because Simon doesn't live near his mother, he can't visit her often. 

If Simon lived near his mother, he could visit her often. 

6. She didn't hurry, so she missed the train.

If she had hurried, she wouldn't have missed the train.

7. John is fat because he eats so many chips.

If John didn't eat so many chips, he wouldn't be fat.

8. Bill never does anything if you don't tell him what to do. 

Unless you tell Bill what to do, he never does anything