Will it work? <-- fine Is it going to work? <-- fine . Both good. YAGH (Yet another gonna hater)

OK, thank you everyone, I think I get your point now :)

I agree with Greg. It is best to learn the rules before you attempt to break them.

Ahmed, "gonna" looks terrible in written English. Even in very informal English (forums, notice boards, etc) people will not commonly write that even if they say "gonna", or in my locality "gunna". It just looks bad and uneducated. I think it even looks worse when you see a learner doing it. As well - and this is my opinion only - as a learner, you should try and say the standard version in conversation until you are speaking at a level equal to a native speaker. The reason I say this is that as a learner or non-native speaker you will already be making pronunciation errors. It makes your English sound worse when you throw in "gonnas".

thanks for the opinion, I appreciate that. well, my English is good enough "My pronunciation too", certainly not fluent and probably will never be but it's good enough :) the thing is, I like to sound natural when I talk to natives, I don't like them to feel like I'm a total stranger, that's why I always tend to use the exact same expressions and way of speaking as I hear them, even if it's not 100% grammatically correct "unless it's something on the professional level of course like a lecture or a meeting". that's why I will probably use gonna more times than going to. is that wrong?