American nt even speak in proper english and follow on the grammar during speaking.I'm a chinese and i speak mandarin but i don't even follow the rules or as to say grammar of mandarin to speak , if i do that i will become a slow speaker

Can I make another suggestion for this thread?  Everyone who posts on this thread stands to be corrected.  Agreed?  No hard feelings, okay, we all learn together.
Dear kailoonthedog, I think I get the gist of what you are trying to convey but I'm afraid it's not properly written there.

Anyone here wants to try and help our fellow forumer?

I don't think accent could be changed.  If you are English, you'll speak with an English accent but if you are an American, you'll speak with an American accent.
So the difference arises when it comes to written English too.