写的一封英文信,求高手进来帮忙检查下有无语法句型错误之类的..

写的一封英文信,求高手进来帮忙检查下有无语法句型错误之类的..
This letter is written to explain why I come back to China during the semester time.
I am currently a student in XXXXXX.I applied the single entry visa in July 2011 and went to Canada in August 2011.My plan was to register the first year Business Management program in September.Because one of my closest relative is going to take a serious surgery in October,I have to go back to China and make sure everything is going fine.Although I will miss the fall semester,I still take the Distributed Learning courses to keep studying.I will go back to Canada in November to join the final exam and the winter semester in January 2012.
大概我想表达的意思就是
我写这封信是为了对我在学期中回国做解释.之后的麻烦大家帮我看看吧...这要递给大使馆的怕有错误意思表达不清楚什么的...希望大哥大姐帮帮小弟~