You won't be able to deech them any Inglish at all. They will soon know and lock you up in the toilette room of the school or "school" building in the hope that someone comes to pull the water handle.

Oh, we have returned to that post. As you may recall we were talking about the teaching of Mandarin and not English.

As for the English, Australians, British, etc, are hired for their oral skills, and they must of course be able to teach reading and writing skills.