" I appreciate your spending time replying to my post. -- This is the correct grammar, but more than needed in this forum. Even better than "thank you" is "Thank you.
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IELTS instructorIf you really want to say spending use a different phrase:
I appreciate the time you spent for reply to my post. (after getting the reply) No, this is not right. "I appreciate the time you spent replying" is okay, but "for reply" is not.
I will appreciate the time you are going to spend for reply to my post (before getting the r