The If Clauses

If Clause Type I

if + Simple Present, will-Future

Type I indicates what will happen, provided that a certain situation is given.



If you send your order by fax, we will deliver the goods immediately.
If you invite me for lunch, I will help you with your presentation.

If Clause Type II

if + Simple Past, would + infinitive

Type II indicates what could happen if a present situation were different.



If we had more employees, we would work more efficiently.
If we delivered poor quality, we would not be the leading company in our business.

If Clause Type III

if + Past Perfect, would + have + past participle

Type III indicates what could have happened in the past if a situation had been different then.



If you had read the paper, you would have seen the advertisement.
If I had taken the bus, I would have been late.


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

Examples (if-clause at the beginning)

type if clause main clause
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.

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