英语大侠帮我翻译一个信件,中译英.大谢

: I think for a long time after sent you a letter, I want to explain to you my special circumstances. My father suffered a stroke, my mother for my grandpa 's funeral, as the only child I from back home has been with my father to the hospital to check and do rehabilitation training. My time is very tight, and the network is not stable, I feel very difficult to finish this course. I want to apply for the drop out of the doors on May class, then choose the back in June of this class. I have been at school, don't have to take care of my father. I don't know the summer class can not be drop, but not drop, I am afraid I can not finish the course. My former two classes are A, therefore, I am not a do not concentrate on their studies. I know this thing to trouble you, but I really have a special situation, please help me.