(1) and (3) are fine. I don't think I would use "for" in (2). I might use "over", or something with more words, such as "in respect of".
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Perfect StrangerI'm quite sure the assignment wasn't there, but I trust your words. In this case, I'm willing to give you credit (here the word credit doesn't refer to a credit a student might receive for his/her work), which is to your ad
GPYThis doesn't make much sense to me. I don't understand what "wasn't there" refers to, and I can't visualise the situation.Thank you GPY. Let me explain.