Help please! one I was in cinema and I sent a message to one of my friends I wrote that " I am still watching the movie " and she said to me when you are in a cinema you should say " I am still seeing the movie " who is right? which sentence is correct?

Considering the way you phrased your question, it looks like you're from the UK. Grammar changes from place to place, but in the US, I can say, "Let's go see a movie," but once we have bought our tickets and sat down in the theater, "we are watching the movie". Around here, it's more what sounds right, but I suppose either can be used.

Last year my daughter had a linguistics class, and her teacher was saying there is no right way to speak, because every part of the world has different customs and dialects of various languages. She seemed to think that whatever you say is fine, because you said it, and you are communicating to people in your culture the way you want to...or something like that.

My daughter and I discussed this, and we concluded that for clarity of meaning such as communication between dialects, or educational purposes, there must be an accepted way to speak formal English. I think her teacher disagreed with her.

I would say that you are more correct, as watching something involves more participation, as when you are watching something you are studying it intently, whereas you can see something for example out of the corner of your eye but not really be paying any attention to it.

Both are, within reason, correct: there is no one way of phrasing such a thing. But, on balance, I would say you are more correct. "Watching" is an active concept: you do it because you want to. You were, presumably, interested in and actively following the movie. Seeing is a passive thing: you can see things whether you want to or not. When you bump your head, you "see" stars - you don't chose to. You can see nothing, you cannot watch nothing. There can be a watcher in the dark, but not a seer in the dark. If you were just "seeing" the movie, not "watching" it, I would guess you were up to other business in th back row.