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7-1 The form of modal auxiliaries
7-2 Expressing ability: can and could
7-3 Expressing possibility: may, might, and maybe Expressing …
7-4 Using could to express possibility
7-5 Polite questions: may I, could I, can I
7-6 Polite questions: would you, could you, will you, can you
7-7 Expressing advice: should and ought to
7-8 Expressing advice: had better
7-9 Expressing necessity: have to, have got to, must
7-10 Expressing lack of necessity: do not have to Expressing: …
7-11 Making logical conclusions: must
7-12 Tag questions with modal auxiliaries
7-13 Giving instructions: imperative sentences
7-14 Making suggestions: let's and why don't
7-15 Stating preferences: prefer, like...better, would rather
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