Re: Is it correct to say, 'Thank you for your promptly reply'

Originally Posted by
learning54
I knew that something was wrong? It has to be an adjective not and adverb. Right?

Thank you so much for your reply.
Best,
L54
Right. The RESPONSE is a noun, so it's a prompt reply.
If you want to thank them for the ACTION, you can say "Thank you for replying so promptly."
Look at this as a step forward -- you realized your own mistake!
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.