Obligation: Police officers have to wear a uniform., You must switch off your mobile phone in the class., It is obligatory for builders to wear speacial helmets., It is essential for Karen to keep fit., No obligation: You don’t have to drink that., You don't need to do the exercises at the end of this page., It's not necessary for you to buy the cake, I'll do that., You don't have to read the chapter., Prohibition: You are not allowed to tell John., You can't use your mobile phone while driving., You mustn’t be late., Advice: It's a good idea to go to the dentist., You should go to bed earlier., If you a sore throat, you should see a doctor.,

Gateway B1 unit 7 modal verbs

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