http://www.englishpage.com/conditional/conditionalintro.html
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences
http://www.usingenglish.com/articles/english-conditionals-an-introduction.html
http://www.grammar-quizzes.com/conditionsum.html
Meaning of the “If clause”
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Verb Form in the “If clause”
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Verb Form in the “Result Clause”
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Examples
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0 Conditional
(FACTUAL): Always true in the present
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Simple present
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Simple present
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If I have enough time, I write to my parents every week.
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1st Conditional (FUTURE): True in the future
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Simple present
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Will/be going to
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If I have enough time tomorrow, I will write to my
parents.
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2nd Conditional (HYPOTHETICAL): Untrue in the present/future
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Simple past
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Would + base form
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If I had enough time now, I would write to my parents.
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3rd Conditional (HYPOTHETICAL IN THE PAST):
Untrue in the past
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Past perfect
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Would have + past participle
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If I had had enough time, I would have written to my
parents yesterday.
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Mixed Conditional
(HYPOTHETICAL PRESENT as a result of HYPOTHETICAL PAST):
Untrue in the past/present
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Past perfect (PAST)
Simple past (PRESENT)
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Would + base form
Would + be + ING
(PRESENT)
Would + have + past participle
(PAST)
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If I had finished all my work, I would be writing to my
parents now.
If I hadn’t drunk that last beer, I wouldn’t be hungover
now.
If I spoke Spanish, I would have gotten the job.
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