1) You won’t finish on time if you don’t start now (unless): You won’t finish on time unless you start now.
2) Unless you read the instructions, you won’t know what to do (if): If you don’t read the instructions, you won’t know what to do.
3) We’ll go to the cinema tonight if I’m not too tired (unless): We’ll go to the cinema tonight unless I’m too tired.
4) Unless you study harder, you’ll fail the test (if): If you don’t study harder, you’ll fail the test.
5) If the neighbours don’t stop making that awful noise, I’ll call the police (unless): Unless the neighbours stop making that awful noise, I’ll call the police.
6) Mum won’t let him go out if he doesn’t finish his homework first (unless): Mum won’t let him go out unless he finishes his homework first.
7) The headache won’t go away unless you do something about it (if): If you don’t do something about it, the headache won’t go away.
8) She won’t hear you if you don’t speak louder (unless): She won’t hear you unless you speak louder.
9) I’ll be back at six unless I have to work late (if): I’ll be back at six if I don’t have to work late.
10) He will never find a job unless he starts looking for one now (if): If he doesn’t start looking for a job now, he will never find one.