15. Leave me alone or I’ll call the police.
Unless………………u leave me alone I will call the police ...
16. If you arrive at the office earlier than I do, please turn on the air-conditioner.
Should………you arrive at the office earlier than I do, please turn on the air-conditioner.....
17. The children don’t go to school in the snowy weather.
If it …………were not for the snowy weather the children wouldn't go to school....
18. He died so young; otherwise, he would be a famous musician by now.
Had …he died soyoung he would be a famous musician by now.………………….
19. You must tell me the whole truth or I won’t help you.
Unless…u tell me the whold truth, I won't help you ...………………….
20. The car breaks down so often because you don’t take good care of it.
Were I… to take good care of it, the car would break down so often ……………………………
21. He is very bad-tempered, that’s why his wife left him soon after marriage.
If he weren't.. very bad-tempered, his wife wouldn't leave him soon after marriage....

15. Unless you leave me alone , I'll call the police .
16. Should you arrive at the office earlier than I do, please turn on the air-conditioner.
17. If it were snowy, the children wouldn't go to school..
18. Had he died so young, he would be a famous musician by now.
19..Unless you tell me the whole truth, I will not help you.
20. Were I to take good care of it, the car would break down so often.
21. If he weren't very bad-tempered, his wife wouldn't leave him soon after marriage.