"could" is not wrong. "if ... " just denotes less certainty than "if ...
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AnonymousIf she had studied more, she would have passed the exam. Why is COULD wrong?You are mistaken. "Could" is not wrong.
Henry74I think I can help on this one.Thanks. By the way, I just picked a verb, any verb, as an illustration. I wasn't trying to translate the sentence itself.