If you want to improve!

You are the master of yourself,only you well understand of your heart.If you don't understand something and you wouldn't ask or search you newer know that.In a classroom specially a lecture there are many students,and lecture have a time limit.so your lecturer couldn't able to ask everone include you whether understood or not.So don't be shy and don't think other person,because they are same with you .if they know that they wouldn't be there.You don't know so that is why you are here.Learn to ask “Excuse me, I can’t hear you. Please repeat what you said,” and, “I’m having trouble understanding what you just said. Do you mean . . .?”.