Hi there. I always hear that people say "it's no big deal" but I occasionally happened to hear that someone also said and I quote "It's not a big deal" or "It's not big a deal" so I was wondering if you guys could tell me which is the right one and in case there are more than one answer which one use the most ?......................thanks.
***PS. Just so you know, I am not good at Englsih so I also want you to correct my writing above if there is something wrong .****