1. Yes, it's grammatically OK. It's asking if someone has already decided (as opposed to anticipating a future decision).
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Anonymousis the following possible?
If you have made your decision, we would send you the details.
CalifJimAre you asking about that specific sentence, or about the tense sequences themselves?I was asking about the tense sequences themselves and you have answered my question. That was helpful.
CalifJimIf your product didn't sell [on some past occasion], please find what to do in this link.So this is one of the exceptions where the 'if' clause has a verb in past tense and the result clause in present tense. In this case, the below sequence is possible. Is this correct? I might have misunderstood something.