Are all of these grammatically correct and equivalent?
Even if I fail
Even should I fail
Even if I should fail
What are the differences, if any? Could the last example be misinterpreted to mean that failing is a desirable outcome?
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All three are grammatically correct, and have the same meaning. However, they are not grammatically equivalent: the first is set in the future real (or "factual") conditional tense, while the second and third are set in the future unreal (or "counterfactual") conditional.
All of them are grammatically correct and mean the same thing. The last example means "even if I did actually fail"
Every time you look at different phrases I find ngrams really useful
(unfortunately you can't really choose which corpus is searched, but you can see in which books and publications the results were found).