| Adapted from Betty Azar's Fundamentals of English Grammar Book |
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| TRUE IN THE PRESENT | IF clause = simple present, RESULT clause = simple present/future |
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| If I visit italy this year, I will go to the Trevi Fountain. |
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| If the weather is nice today, we can go to the park. |
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| If the snow falls by morning, we can go skiing. |
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| If I have enough time, I will write a travel book. |
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| NOTE: Superstitions often use this tense. If you knock on wood, your good luck will continue. |
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| UNTRUE IN THE PRESENT/FUTURE | IF clause = simple past, RESULT clause = would / could + simple form |
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| If I visited Italy today, I would go to the Trevi Fountain. |
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| If the weather were nice today, we could go to the park. |
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| If the snow fell today, we could go skiing. |
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| ] | If I had enough time, I would write a travel book. |
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| NOTE: This tense is often used for this example.
If I were you, I would accept the invitation. |
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UNTRUE IN THE PAST | IF clause = past perfect, RESULT clause = would have + participle |
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| If I had visited Italy this year, I would have gone to the Trevi Fountain. |
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| If the weather had been nice yesterday, we could have gone to the park. |
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| If the snow had fallen by morning, we could have gone skiing. |
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| If I had had enough time, I would have written a travel book. |
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