Because the student has returned a lesson or article XI anchovies that registered students in the classroom as it is to understand that the teacher more or we know where we can not understand the information correctly.
Because the students to review lessons in the classroom or the students taking it as understood in the teacher more. We do not understand or know where we can find the correct information.
Because the students come back to review the lesson or what the students taking the class it is to understand the teacher more and more. Or we know where we can find information to understand correctly.