1. 3 . Examples (if-clause at the end)
1.1. Type 1 :
1.1.1. main clause : I will pass the exam
1.1.2. if-clause : if I study.
1.2. Type 2
1.2.1. main clause : I would pass the exam
1.2.2. if-clause : if I studied.
1.3. Type 3
1.3.1. main clause : I would have passed the exam
1.3.2. if-clause : if I had studied.
2. 1. Form
2.1. Type 1
2.1.1. if-clause : Simple Present
2.1.2. main clause : will-future or (Modal + infinitive)
2.2. Type 2
2.2.1. if- clause : Simple Past
2.2.2. main clause : would + infinitive *
2.3. Type 3
2.3.1. if- clause : Past Perfect
2.3.2. main clause : would + have + past participle *
3. * We can substitute could or might for would (should, may or must are sometimes possible, too).
3.1. I would pass the exam.
3.2. I could pass the exam.
3.3. I might pass the exam.
3.4. I may pass the exam.
3.5. I should pass the exam.
3.6. I must pass the exam.
4. There are three types of conditional sentences :
4.1. Type I ( conditional ) condition possible to fulfill
4.2. Type II ( conditional ) condition in theory possible to fulfill
4.3. Type III ( conditional ) condition not possible to fulfill (too late)
5. Type 1
5.1. +
5.1.1. long forms : If I study, I will pass the exam.
5.1.2. short / contracted forms : a. If I study, I'll pass the exam.
5.2. -
5.2.1. long forms : a. If I study, I will not fail the exam. b. If I do not study, I will fail the exam.
5.2.2. short / contracted forms : a. If I study, I won't fail the exam. b. If I don't study, I'll fail the exam.
6. 2. Examples ( if- clause at the begnning )
6.1. Type 1
6.1.1. If - clause : If I Study,
6.1.2. main clause : I will pass the exam.
6.2. Type 2
6.2.1. if clause : If I studied,
6.2.2. main clause : I would pass the exam.
6.2.3. main clause : I would pass the exam.
6.3. Type 3
6.3.1. if clause : If I had studied,
6.3.2. main clause : I would have passed the exam.
7. 4. Examples (affirmative and negative sentences)
7.1. Type 2
7.1.1. +
7.1.1.1. long forms : If I studied, I would pass the exam.
7.1.1.2. short / contracted forms : If I studied, I'd pass the exam.
7.1.2. -
7.1.2.1. long forms : a. If I studied, I would not fail the exam. b. If I did not study, I would fail the exam.
7.1.2.2. short / contracted forms : a. If I studied, I wouldn't fail the exam. b. If I didn't study, I'd fail the exam.
7.2. Type 3
7.2.1. +
7.2.1.1. long forms : If I had studied, I would have passed the exam.
7.2.1.2. short / contracted forms : If I'd studied, I'd have passed the exam.
7.2.2. -
7.2.2.1. long forms : a. If I had studied, I would not have failed the exam. b. If I had not studied, I would have failed the exam.
7.2.2.2. short/contracted forms : a. If I'd studied, I wouldn't have failed the exam. b. If I hadn't studied, I'd have failed the exam.