FOR BAC STUDENTS if clauses type 1.2&3

:بسم الله :
Conditional sentences, if-clauses type I, II, III

Conditional sentences

Conditional sentences are sometimes confusing for learners of English as a second language.
Watch out:
[list=text-list]
[*]Which type of conditional sentences is it?
[*]Where is the if-clause (e.g. at the beginning or at the end of the conditional sentence)?
[/list]
There are three types of conditional sentences.
[th]type[/th][th]condition[/th]

I	condition possible to fulfill
II	condition in theory possible to fulfill
III	condition not possible to fulfill (too late)

1. Form

[th]type[/th][th]if-clause[/th][th]main clause[/th]

I	Simple Present	will-future or (Modal + infinitive)
II	Simple Past	would + infinitive *
III	Past Perfect	would + have + past participle *

2. Examples (if-clause at the beginning)

[th]type[/th][th]if clause[/th][th]main clause[/th]

I	If I study,	I will pass the exam.
II	If I studied,	I would pass the exam.
III	If I had studied,	I would have passed the exam.

3. Examples (if-clause at the end)

[th]type[/th][th]main clause[/th][th]if-clause[/th]

I	I will pass the exam	if I study.
II	I would pass the exam	if I studied.
III	I would have passed the exam	if I had studied.

4. Examples (affirmative and negative sentences)

[th]type[/th][th] [/th][th]Examples[/th][th] [/th][th] [/th][th]long forms[/th][th]short/contracted forms[/th]

I	+	If I study, I will pass the exam.	If I study, I'll pass the exam.
I	-	If I study, I will not fail the exam. If I do not study, I will fail the exam.	If I study, I won't fail the exam. If I don't study, I'll fail the exam.
II	+	If I studied, I would pass the exam.	If I studied, I'd pass the exam.
II	-	If I studied, I would not fail the exam. If I did not study, I would fail the exam.	If I studied, I wouldn't fail the exam. If I didn't study, I'd fail the exam.
III	+	If I had studied, I would have passed the exam.	If I'd studied, I'd have passed the exam.
III	-	If I had studied, I would not have failed the exam. If I had not studied, I would have failed the exam.	If I'd studied, I wouldn't have failed the exam. If I hadn't studied, I'd have failed the exam.