Can't agree on the english corner, if it is not in your contract. The chinese like to play hardball, sometimes you have to be thick skinned and stand up for yourself and fight back. Rules of communication and social norms are ass backwards in China, and if you don't cotton on once, you will be attacked relentlessly with requests for english corners and the classic "I have a friend, who has a school, and.....".

Draw a clear line in the sand, stand behind it, and don't budge on your principles. Show weakness once and you leave yourself wide open to being infringed upon again and again.