M: another question, it has confused me for almost two years.
M: when you take an exam, for example, the time is one hour. then in the middle, you want to know how much time left, how to say it
M: how to ask this question?
U: Are you allowed to ask questions during the exam?
M: yeah, I can ask the teacher.
U: "May I ask how much time is left until the exam is over"
M: oh, the sentence is so long
U: "how much time"
U: wear a watch and you will always know what time it is