It's dangerous so everyone have to wear a helmet when climbing - everyone has to , Visitors must to wear a name badge at all times - must wear, The driver must checks that everyone is wearing their seatbelts. - must check, All students have to changing their password every week. - have to change, You don't have to run next to the swimming pool. You might slip over. - You mustn't run , Anyone over eighteen hasn't to stay in the school at lunch. - doesn't have to stay, When I was at school we did have to sign our names in a book every day. - we had to sign, They didn't had to go to classes for more than two weeks - They didn't have to go,

Grammar: Modals of obligation - present/past (Intermediate level 3.2)

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