Here are the verbs put in the correct forms:

1. If it **is** nice, I’ll go camping, but if it **is not** I’ll stay at home.
2. If it’s too expensive, I **will have** to borrow some more money.
3. I **will send** you a cable if there **is** a post office there.
4. If he **goes** by plane, it’ll take him two hours.
5. If I see her, I **will give** her a gift.
6. She may be late if she **does not hurry**.
7. Mary (not visit) **won’t visit** you if she has a test next week.
8. If he **studies** hard, he can pass the exam.
9. Tell him to ring me if you **see** him.
10. If you do not like this one, I’ll bring you another.
11. I’d tell you who he is if I **knew**. He’s a stranger.
12. If I had a watch, I **would tell** you what time it is.
13. If I **had** the test, I’d go with you.
14. Water (not run) **does not run** downhill if there were not gravity.
15. What would you **do** if you found a burglar in your house?
16. If I **were** you, I **would accept** the job.
17. He couldn’t get fat if he **did not stop** smoking.
18. If she **did** her hair differently, she would look quite nice.
19. If I **got** one more mark, I’d pass with honours.
20. I didn’t know you were in hospital. If I **had known**, I **would have gone** to visit you.
21. Ken got to the station in time to catch his train. If he **misses** it, he **will be** late for his interview.
22. It’s good that you reminded me about Ann’s birthday. I **forgot** to remind me.
23. Unfortunately, I didn’t have my address book with me when I was in New York. If I **had had** your address, I **would have sent** you a postcard.
24. How was your holiday? Did you have a nice time? It would be better if the weather **were** nicer.
25. I took a taxi to the hotel but the traffic was very bad. It **would be** quicker if I **walked**.
26. If I **saw** you when you passed me in the street, I **would say** hello.
27. If I **had gone** to the party last night, I **would have seen** Ann.
28. He failed the exam. If he **had studied** harder, he **would have passed** it.
29. She was ill. She **would not be** ill if she **did not eat** so much ice cream.