i have taken notes on your book however i still have questions

i have taken notes on your book however i still have questions

When I was teaching English subject in school at that time, one of the bright students in my class asked the meaning of this sentence, and whether it is grammatically correct or not the sentence as i have taken notes on your book however i still have questions

            The student also asked me to please write this sentence onboard and explain it to all the students in the class. One problem arises with me that the bright student asking me suddenly about the correctness of this sentence. It is not easy for any teacher to quickly solve grammatical mistakes, so I can’t answer rapidly. The student also told me that please solve my problem as early as possible because I will take to participates in some English language competitions the next day.

 Finally, I told the bright student that I will solve this question during recess time of school. During recess time, I was sitting in my staff room at that time; I was trying to solve problems, and I was getting an answer is that ………… I have taken notes on your book; however, I still have questions.                                      

When recess of the school over, I met that student and gave him these correct answers, and that time, that student became happy.