1.i will get a work permit. i will stay for another month.

=>if I don’t get a work permit, I won’t stay for another month.

2.he doesn't take any exercies. he is so unheathy.

=>if he took any exaecises, he would be healthy.

3. we can't get the ticket because i don't have the right change.

=>if I had the right chance, we could get the ticket.

4.study hard or you won't pass the exam.

=>if you don’t study hard, you won’t pass the exam.

5.don't be impatient or you will make mistakes.

=>if you are impatient, you will make mistakes.
 

6.i only come if they invite me

=>unless they invite me, I won't come
 

7. the park is over there,only 5 minutes' walk.

=>if you walk to the park, it will take you 5 minutes.
 

8. leave me alone or i'll call the police.

=>unless you leave me alone i will call the police.
 

9.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......

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

=>if it....weren't snowy ,the children would go to school....
11. 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.

12. Were I to take good care of car,it wouldn't break down so often
13. If he weren't bad-tempered, his wife wouldn't have left him soon after marriage
14. If you tell lies to your boss, you will be fired at once.