Parents can visit any class at any time , all day long . I watched an English class . Last time , there were a lot of parents in the class , however this time there were no other parents but me ! The teacher said , "Today we have a special guest . Let's greet her with a cheerful Hello ." All the children turned toward me . "Whose mother is she ?" There was a general stir in the class . My son and I felt embarrassed . After that the teacher sometimes called on me to answer . My English studies have come in useful .