1 You ought to wear a life jacket if you go swimming in the sea
2 I will tell you my secret, but you mustn’t tell anyone
3 You spend too much time on playing computergames, you must sop it
4 Phuong oughtn’t to eat too much chocolate, or she will gain overweight
5 We have to wear helmets when she ride a motorbike
6 I don’t have to book the tickets advance
7 Alia musnt’t say rude words like that
8 We don’t have to play table tennis, we can play chess instead
9 Children musn’t put their hands into sockets because that is very dangerous
10 Doctors sometimes have to work at the weekends and on national holidays
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