请高手看看我的英语信件中可有错误,望斧正.

请高手看看我的英语信件中可有错误,望斧正.
Dear Lecturer Liu
My name's xxx.I do not know if you are familiar with this name,but I am sure you are if you called the roll before classes.I have been absent from your classes three times with no reasons provided.And I felt obliged to write to explain my uncountable absences.
Fist of all,I make my apologies.I know what I have done could be regarded as disrespect,but I want you to know I did not mean it.I admit I overslept the fist time,but I do have reasons for next ones.I was stuck in something which is,actually ,very inconvenient to talk about.Something very personal,as you might know.And because of this,I did not ask off.I hope you can understand.But now I am very happy to say it's done,which means I won't miss any classes of yours any more.I know whether I attend or not is not important to you but it is important to me.
When we had a chance to rechoose courses,I did not change my choice.I was so determined that I did not even know when the course rechoosing started and ended.I did not care.I know I like the way you speak English and things you talked about in the classes.I am sure I can learn something.All these words written are meant to show my passion in your course and I am wondering if there's something I can do to change the bad impression I might have given.
So,once again,I do my apologies

I am sure you are if you called the roll before classes要用主将从现
you will be
rechoose 不是英语单词
其他还好