"gonna", "wonna",

Well said, Turnoi.

I suppose it's right that students should know what these words mean, otherwise they are going to have problems following Hollywood films, or understanding some Westerners they come across; however, the sad state of affairs in crap Centres is they will be taught these as good English.

As far as grammar is concerned, I have told my students that when and if you progress way past the level of being fluent, if you are good enough you can[selectively] start using bad grammar. I have to say that i have never met a fluent English speaker outside of a native born speaker who could get away with it- as you know it's called bad grammar but extremely good English. Anyway, I'm no academic like yourself so I'll bow to your knowledge that there are good non native English speakers out there that can give us a run for our money.

Carry on the good work.