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If clauses
There are three types of "if" clauses :
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type
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"if" clauses
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main clauses
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condition possible
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Simple Present
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will + future
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condition in theory possible
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Simple Past
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would + Infinitive
(Conditional)
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condition not possible
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Past Perfect
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would + have + past participle
(Conditional Perfect)
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type
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example
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condition possible
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positive
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If I learn, I' ll pass the exam.am.
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negative
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If I learn, I won't fail the exam.
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condition in theory possible
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positive
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If I learned, I would pass the exam.
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negative
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If I learned, I wouldn't fail the exam.
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condition not possible
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positive
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If I had learned, I would have passed the exam.
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negative
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If I had learned, I wouldn't have failed the exam.
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