1. I didn’t have an umbrella with me so I got wet.

I wouldn’t have got wet if I had had an umbrella.

2. I’ll call the police if you don’t leave me alone.

Unless you leave me alone, I'll call the police.

3. In the snowy weather we don’t go to school.

If the weather is snowy, we don't go to school.

4. Without Jack’s help, I wouldn’t have been able to move this table.

If Jack hadn't helped, I wouldn't have been able to move this table.

5. You drink too much coffee, that’s why you can’t sleep.

If you didn't drink too much coffee, you could sleep.