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1 You mustnt hurt children 
2 You mustnt stay/be here
3 You mustnt feed animals in the zoo
4 We cant/mustnt use the phone on private business
5  One shouldnt interrupt each other during the discussion 
6 You musnt show him that you feel sorry for him 
7 You musnt/shouldnt contradict him, you must respect his age 
8 She shouldnt have missed the seminar 
9 "You mustnt argue with older people" said Mother 
10 You shouldnt have interfered in their affairs. You have spoilt everything