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17 Think what to say using can/could, may/might, shall, must, would, would you like, would you mind:

1 Ask someone to answer the phone for you. 2 Invite a friend to go for a swim this afternoon. 3 Offer to make someone a sandwich. 4 Offer to open the door for a stranger. 5 Give someone permission to use your phone. 6 Suggest going for a picnic this weekend. 7 Ask someone to wait here for you. 8 Give your sister permission to take your player but tell her to return it soon. 9 You are in a train. Ask another passenger if you can open the window. 10 Ask a friend for a pen. 11 Suggest buying a take-away meal tonight. 12 Offer to answer the phone.

18 Complete the replies by giving advice or making a recommendation using should/ought to or had better:

1 I’ve got a toothache. – You … go to the dentist. 2 He failed his exam. – He … have worked harder. 3 Our train leaves in a few minutes. We … take our seats. 4 Peter was involved in an accident with his car. – He … not have been driving so fast. 5 Our tent was always getting blown down when we were on holiday. – You … have stayed in a hotel. 6 Mary got terribly sunburnt yesterday. – She ... not have lain in the sun so long. 7 We’re spending our holidays in Spain next summer. – You … start learning some Spanish. 8 I’ve been feeling rather off colour recently. – You … see a doctor. 9 We all got soaked in yesterday’s downpour. – You … have taken umbrellas with you. 10 There’s ice on the roads this morning. – You … not take the car. 11 My passport expires next month – You … get it renewed. 12 There’s somebody knocking at the door. – You … look who it is. 13 I overslept again this morning. – You … buy yourself an alarm clock. 14 You are always late for your classes. You … get up earlier. 15 Let’s face it! We’re hopelessly lost! We … ask someone the way.

19 Fill in the blanks with necessary modal verbs or their equivalents:

1 20 percent or more above desirable weight … be a significant added burden for the heart and vascular system. 2 Various theories about the difference between the indexes propose that the real answer … lie in a combination of factors. 3 Although smoking is an addiction, people … quit smoking. 4 By smoking, you cause health problems not only for yourself but also for those around you. 5 If children with asthma live with two or more smokers, they … be more than four times as likely to be absent from school with respiratory illnesses. 6 Patients … be more effectively educated about the health consequences of smoking during pregnancy. 7 Although air conditioning … remove the visible smoke it … not remove the particles that continue to circulate and are hazardous to your health. 8 In fact, many of the chemicals in the cigarettes, like nicotine and cyanide, are actually poisons that … kill in high enough doses. 9 When your parents were young, people … buy cigarettes and smoke pretty much anywhere – even in hospitals! 10 When quitting, it … be helpful to realize that the first few days are the hardest, and it’s normal to have a few relapses before you manage to quit for good. 11 Smokers … themselves be aware of the harm of smoking. 12 Chronic bronchitis … change the structure of the respiratory pathways so much that it … curtail lungs and heart function. 13 If both parents smoke, a teenager … be expected to smoke. 14 The best chance to enjoy a healthy and full life … not be done unless we tackle smoking. 15 Researches estimate that one quarter of cot death … be caused by mothers smoking. 16 The addictive power of nicotine is so strong that millions of people continue to smoke (despite multiple attempts to quit), even though they know that cigarettes … kill them.

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