1. If you doesn’t sneeze, he won’t know that we are there.
--> Unless you sneeze, he won't know that we are there 
2. . If I don’t come here early, I will miss the bus.
→ Unless you come here early, I will miss the bus 
3. If you don’t leave the office, I will call the police.
→ Unless you leave the office, I will call the police 
4. If she doesn’t water these trees, they will die.
→ Unless she waters these trees, they will die 
5. I only come if they invite me.
→ Unless they invite me, I won't come 

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Unless you sneeze, he won’t know that we are there.

Unless I come here early, I will miss the bus.

Unless you leave the office, I will call the police.

Unless she waters these trees, they will die.

Unless they invite me, I won't come