The request of prolonging stay from Jerry

I'm Jerry, the visiting student from Tsinghua University.  Time flies fast.  I have been at Ann Arbor for nearly four months.  I enjoyed the stay at Ann Arbor very much.  During the past a few months, I took three classes, including Mathematics for Political Science instructed by Professor Iain Osgood, Multivariate Analysis instructed by Professor Rocio Titiunik, and the Use of Social Science Computer Programs.  In addition, I took part in the China Reading Group organized by Professor Mary Gallagher and a series of academic lectures.
 
According to my previous plan, I would leave by the middle of February. However, I find it would not be a good time to leave due to it is just at the middle of the winter semester.  So I would like to know if I could extend my stay until the end of March. Then I could almost finish the classes of winter semester.
 
Thank you very much!

With all regards,

Jerry