Решить. 1) ann may/has to leave school early tomorrow. she has a dentist appointment after school. 2) if ben gets permission from his parents, he may/ must study in france next year. 3) kate should have/ must have studied a lot for the history exam. he got very high mark. 4) students mustn’t/ needn’t run in the school corridors. it’s against the rules. 5) you can/must raise your hand and wait before you ask a question.