1. I and II

2.  Situations that are always true if something happens.   NOTE: This use is similar to, and can usually be replaced by, a time clause using 'when' (example: When I am late, my father takes me to school.)  If I am late, my father takes me to school. She doesn't worry if Jack stays out after school.

3.  Conditional 0 is formed by the use of the present simple in the if clause followed by a comma the present simple in the result clause. You can also put the result clause first without using a comma between the clauses.  If he comes to town, we have dinner. OR We have dinner if he comes to town.

4.  Often called the "real" conditional because it is used for real - or possible - situations. These situations take place if a certain condition is met.

5.  NOTE: In the conditional 1 we often use unless which means 'if... not'. In other words, '...unless he hurries up.' could also be written, '...if he doesn't hurry up.'.  If it rains, we will stay at home. He will arrive late unless he hurries up. Peter will buy a new car, if he gets his raise.

6.  Conditional 1 is formed by the use of the present simple in the if clause followed by a comma will verb (base form) in the result clause. You can also put the result clause first without using a comma between the clauses.  If he finishes on time, we will go to the movies. OR We will go to the movies if he finishes on time.

7. 1. If he comes,  we will go to lunch.  we would go to lunch.  we went to lunch.

8. 2. If he studies a lot,  he might pass the exam.  he would pass the exam.  he is going to pass the exam.

9. 3. If she misses the bus,  I take her to school by car.  I would take her to school by car.  she have to walk.

10. 4. He will surely fail his exams  if he not work harder.  unless he begins to study.  if he weren't serious.

11. 5. I leave on Saturdays  if she will come to visit.  if she comes to visit.  if she won't come to visit.

12. 6. She will go crazy  if you leaves her.  unless she leaves you.  if she don't leave you.

13. 7. If this storm gets worse,  we will have to go inland.  we have to get inland.  we must to go inland.

14. 8. Watch out! If you touch that cable,  you will get a shock.  you shocked.  you had a shock.

15. 9. I'm afraid I can't understand you  if you speak unclear.  unless you speak more clearly.  if you don't speak clear

16.  Often called the "unreal" conditional because it is used for unreal - impossible or improbable - situations. This conditional provides an imaginary result for a given situation.  NOTE: The verb 'to be', when used in the 2nd conditional, is always conjugated as 'were'.  If he studied more, he would pass the exam. I would lower taxes if I were the President. They would buy a new house if they had more money.

17.  Conditional 2 is formed by the use of the past simple in the if clause followed by a comma would verb (base form) in the result clause. You can also put the result clause first without using a comma between the clauses.  If they had more money, they would buy a new house. OR They would buy a new house if they had more money.

18. 10. I would buy a new house  if I have a lot of money.  if I win the lottery.  if I inherited a million dollars.

19. 11. If I had known you were in town,  I would buy you some flowers!  I would have bought you some flowers.  I will buy you some flowers.

20. 12. She would live in New York now  if she stays.  if she had stayed.  if she was to stay.

21. 13. They would have bought that new car  if they had had the money.  if they had the money.  if they were having the money.

22. 14. If he were President,  he would help the poor more.  he will help the poor more.  he would have helped the poor more.

23. 15. She would have gone  if she had been in your position.  if she were in your position.  if she was in your position.