I've been thinking of an enquiry, turning in my head, and as I couldn't get a satisfactory answer,or rather, people around me did not answer it confidently, I suspect the answers given by them. So I thought it would be the best choice to ask the question here, too. I know the normal usage of if clauses, but can we use simple past tense in the first part of the sentence when we want to indicate an event of the past, whose result is obscure, as we do it, using present perfect tense?
For instance, let's say " If Bob has not finished his duty, it will bring an enormous disgrace on his academic career". In this case, we don't know if Bob has already finished his duty. He might have finished it, or vice versa.
If we had said " If Bob didn't finish his duty, it will bring an enormous disgrace on his academic career", would it be correct in terms of both meaning and grammar, as well?
To tell the truth, I frequently see it being used in films but I think they don't much care about grammar, do they?
Anyhow, I hope someone will give a reliving answer to me
Thanks in advance :)