Matching Pairs RULES!!Online version modal verbs for rules by Ilaria Tabet 1 Everyone can enjoy the park. 2 There are signs everywhere saying that teenagers can't ride skateboards or bikes. 3 They know they must keep their park clean. 4 You don't have to pay to use the park...it's free! 5 You can get up later today... it's Sunday! 6 We don't have to wear a uniform at school, thank God! 7 You mustn't be late for the test! 8 They know they mustn't leave rubbish in the park. prohibition it's not necessary it is not allowed obligation it is allowed prohibition it is allowed/possible it's not necessary