2. If you aren't locking your car, someone will steal your radio.
Unless you lock your car, someone will steal your radio.
Lock your car or someone will steal your radio.
3. If you aren't writing down the number, you will not remember it.
Unless you write down the number, you will not remember it.
Write fown the number or you won't remember it.
4. If you aren't going away, I will call the police.
Unless you go away, I will call the police.
Go away or I will call the police.
5. If you aren't early, you will not get good seats near the front.
Unless you are early, you will not get good seats near the front.
Be early or you will not get good seats near the front.
