Conditional Sentences or Conditional Clauses or If Clauses.

Conditional Sentence Type 1

It's possible and also very likely that the condition will be fulfilled. 
Form: if + Simple Present , will (future)

Example:

1. If I go to campus, i will meet my friends.

2. If tono has the free time, he will go to cinema.

3. If she eat junk food, she will get an obetity

Conditional Sentence Type 2

It's possible but very unlikely, that the condition will be fulfilled.

Form: if + Simple Past, Conditional I (= would + Infinitive)

Example:

1. If I went to campus, i would meet my friends.

2. If rudi run, he would't bite by a dog

3. If she ate junk food, she would get an obetity

Conditional Sentence Type 3

It's impossible that the condition will be fulfilled because it refers to the past.

Form: if + Past Perfect, Conditional II (= would + have + Past Participle)

Example:

1. If I had went to campus, i would've met my friends.

2. If budi had studied harder, he would't have the bad scores.

3. If the day had rained, you would have brought the umbrella.

Source: http://www.ego4u.com/en/cram-up/grammar/future-1-will

Bahasa Inggris 2: Conditional Santance

Exercise 21, page 97
1. were understand                   11. paint                              21. had studied
2. wouldn't have been               12. were                              22. has hear
3. will give                                13. has write                        23. see
4. would have told                    14. could have permitted      24. has get
5. would have been                  15. were spending                25. turn
6. had                                      16. will accept                      26. were
7. could stop                            17. has buy                          27. would have called
8. were need                            18. has decided                   28. would have talked
9. would have found                 19. would have written        29. explained
10. enjoyed                              20. will leak                        30. spoke




Exercise 22, page 99
1. eating                        
2. eat                                    
3. swim                                
4. like                                   
5. speaking                          
6. studying
7. dance
8. sleeping
9. eating
10. eating

Exercise 23, page 101
1. stay
2. have stayed
3. work
4. study
5. not study
6. have
7. had stood
8. not cook
9. hadn't arrived
10. have slept

Exercie 24, page 105
1. should have had
2. must have been
3. must have damaged
4. must not have parked
5. must have studied
6. should have studied
7. must have been
8. should have deposited
9. must have forgotten
10. must not have studied

Exercise 25, page 105
1. I would
2. would have gone
3. may have had
4. should have done
5. must have forgotten
6. may have slept
7. might have had
8. could have lost
9. shouldn't have driven
10. may have run