If Clause Type I
if + Simple Present, will-FutureType I indicates what will happen, provided that a certain situation is given.
Examples:
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 you invite me for lunch, I will help you with your presentation.
If Clause Type II
if + Simple Past, would + infinitiveType II indicates what could happen if a present situation were different.
Examples:
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 we delivered poor quality, we would not be the leading company in our business.
If they told their father, he would be very angry.
If Clause Type III
if + Past Perfect, would + have + past participleType III indicates what could have happened in the past if a situation had been different then.
Examples:
If you had read the paper, you would have seen the advertisement.
If I had taken the bus, I would have been late.
If I had taken the bus, I would have been late.
If they hadn’t went to home, they would have found the rain
Sumber:
http://khydayme.blogspot.com/2011/04/conditional-sentences-if-clause.html
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