necessary: Students have to complete their homework on time., She has to study for her exams this week., You must listen carefully during the lesson., Teachers must explain the rules clearly., unnecessary: We don't have to come to school on Saturdays., He doesn't have to bring his own books; the school provides them., She doesn't have to attend the extra class if she finishes her work early., it's OK/allowed: Students can ask questions if they don't understand., You can use a calculator during the math test., It's not OK/not allowed: You can't use your phone during the exam., They can't leave the classroom without permission., You mustn't cheat on your tests., Students mustn't talk when the teacher is speaking.,

ACPB-B10-Obligation,necessity and permission - Group sort

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