The relationship between students and teachers is less formal in the USA than in many other countries. American students do not stand up when their teachers enter the room. Students are encouraged to ask questions during class, to stop in the teacher's office for additional help, and to phone if they are absent. Most teachers allow students to enter class late or leave early if necessary. Despite the lack of formality, students are still expected to be polite to their teachers and fellow classmates. When students want to ask questions, they usually raise a hand and wait to be called on. When a test is being given, talking to a classmate is not only rude but also risky. Most American teachers consider students who are talking to each other during a test to be cheating.