Some stuff about the future...

If you don't leave me alone, I'm going to punch you in the face! (is the form "to be going to" used in these kinds of conditional sentences? Or do I alway have to use "will"?) This is OK. You can use either form. Both are ways of saying that if a certain condition isn't met, a certain thing is going to (or will) happen.

If next time you are late again, I'm going to fire you and I'm not going to think twice! (again, is it ok or do I need "will"? "I'll fire you and I won't think twice!") The "going to" is OK, but I think the sentence should be rearranged.

If you are late again next time, I'm going to fire you...

I often hear the present perfect continuous used when there's no arrangement at all, and "to be going to" would be better in my opinion. Look at these:
I drank too much... I'm never drinking again! (is it ok? Would "I'm not going to drink again" be good too?) Both forms are OK. 

I drank too much... I made a fool out of me... I think I'm never drinking again! (I added "I think". Same comments as above)

I made a fool out of myself  (not I made a fool out of me)

Other people may make a fool of me, but only I can make a fool of myself.

I think I'm never drinking again seems a little bit awkward to me. With "think," the sentence that comes to mind first is

I don't think I'm ever going to drink again!

I don't think I'll ever drink again. & I don't think I will ever drink again. ---------OK

Kooyeen wrote:

Hi, I'd like to hear an opinion on these sentences: If you don't leave alone, I'm going to punch you in the face! (is the form "to be going to" used in these kinds of conditional sentences? Or do I alway have to use "will"?) If next time you are late again, I'm going to fire you and I'm not going to think twice! (again, is it ok or do I need "will"? "I'll fire you and I won't think twice!") The 2 above are fine, no problem there. But the one below, I won't saying it like that. I often hear the present perfect continuous used when there's no arrangement at all, and "to be going to" would be better in my opinion. Look at these: I drank too much... I'm never drinking again! This sounds clumsy and makes no sense. [I will never ]and [I am never going to...] mean the samething, but "I am never drinking" is unclear. Consider this: I am never going to / I will never drink like that again. This offer a tone speaking into the future. I drank too much... I made a fool out of me... I think I'm never drinking again! (I added "I think". Same comments as above) What? I should kiss you? No way, I'm not doing that! (is it ok? Would "I'm not going to do that" be good too?) Thanks

Kooyeen wrote:

I often hear the present perfect continuous used when there's no arrangement at all, and "to be going to" would be better in my opinion. Look at these: I drank too much... I'm never drinking again! (is it ok? Would "I'm not going to drink again" be good too?) I drank too much... I made a fool out of me... I think I'm never drinking again! (I added "I think". Same comments as above) What? I should kiss you? No way, I'm not doing that! (is it ok? Would "I'm not going to do that" be good too?)

Kooyeen wrote:

Grammar books (which I'm strating to hate more and more) stresses the fact that the present perfect continuous is used when something has been arranged, one way or another. In reality, I see it's also very used when expressing a strong denial, like: Whaaaat? You little punk, you're grounded for a week! ...and you are not seeing your friends tonight, it that clear? That wasn't planned in any way. So I see the "negative present continuous" as a strong form of "not be going to" in those cases.

I beg your pardon, Kooyen.

I might be missing something, because different trusty posters didn't correct that, but ... where's the present perfect continuous in your sentences?