1.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......

2.the children don't go to scholl in the snowy weather.

=>if it....weren't snowy ,the children would go to scholl....

3.he died so young; oterwise, he would be a famous musician by now.

=>had.....he died so young,he would have been a famous musician by now......

4.you must tell me the whole truth or i won't help you

=>unless......you tell me the whole truth , i won't help you.....

5.the car breaks down so often because you don't take gook care of it.

=> were you to take gook care of it.the car wouldn't break down so often,.........

6.he is very bad-tempered, that;s why his wife left him soon after marriage.

=>if he......he weren't bad-tempered,his wife would leave him soon after marriage...........

20. should you arrive at the office earlier than i do, please turn on the air-conditioner 21. if it weren't snowy ,the children would go to scholl 22.had he died so young.he would have been a famous MUsician by now 23.unless you tell Me the whole truth ,i won't help you 24.were you to take gook care of it.the car wouldn't break down so often 25.if he weren't bad-tempered,his wife would leave him soon after Marriage