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“Will have” vs. “Would have”

I read somewhere that it is "I will". Which rule is this? Where can I find these rules for tenses?

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You may be interested in this post. –  KitFox Aug 3 '11 at 17:15
    
@Kit: Wow! I had never seen this question/answer before! When I was working on structuring a new language, I drew up a chart very similar to that one. –  Daniel Aug 3 '11 at 17:25
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marked as duplicate by JSBձոգչ, KitFox, Daniel, RegDwigнt Aug 3 '11 at 18:35

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1 Answer

up vote 3 down vote accepted

"I will" means it is the current plan or expectation. "I would" implies it is no longer the expectation:

If I get the tickets tonight, I will have left by this time tomorrow.

vs.

If the tickets had not been canceled, I would have left by this time tomorrow.

EDIT: One more case that I had forgotten, the pure subjunctive or counterfactual, where the main clause has never been the expectation:

If Detroit were a nice place to live, I would have left for there by this time tomorrow.

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You're right. I forgot about the if-then possibility. –  Daniel Aug 3 '11 at 17:19
    
@Malvolio: Wow! thanks for the wonderful answer –  Bruce Aug 3 '11 at 17:49
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