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Tham khảo tài liệu 'longman english grammar practice intermediate self study edition phần 7', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 11.9 It s advisable .7 It s necessary . 11.9C Expressing necessity in other tenses LEG 11.50-51 11.46 study 1 Must can refer to the present or the future I must speak to him today. I must speak to him tomorrow. 2 Must is not a complete verb so we use have to to make up its missing parts 11.1B I shall will have to phone her tomorrow or I must phone her tomorrow. future I had to spend the day in a meeting past I have had to tell you before present perfect I am having to l have been having to get up earlier this year progressive forms 3 Had to shows that we couldn t avoid doing something I had to leave at six. and I did Should have shows we ve failed to do something I should have left at six. and I didn t Write Use a construction with have to in place of the words in italics. 1 It will be necessary for him to try harder if he wants to win the prize. .H .ỊỊ ịíịfí.ỊUỊyyẹ .Xữ. 2 It has been necessary for them to save hard to buy their new hi-fi. 3 Because of the snow she has been finding it necessary to walk to college. 4 It had already been necessary for US to clear the office floor twice before the boss asked us to clear it again. 5 It would have been necessary for me to pay twice as much to travel first class. 6 We are finding it necessary to cut back on staff because of a shortage of orders. 11.9D Context Write Put in will have to must having to has to should had to have to and should have. Use each one at least once. ARIJABA The Post Office in Britain is famous for getting letters and parcels to their destinations. The problem is that we the public 1 .h i Ăữ.observe the rules. For example we 2.put a stamp on a letter. If we don t the recipient3.pay double. We often see the sign ALL LETTERS4. BE CORRECTLY ADDRESSED. These days this means 5.use postcodes. If you didn t use a postcode it s no good complaining that your letter6.arrived sooner. Parcels are a problem because they7.be correctly packaged. If Aunt Sophie is going to send you a jar of your favourite jam she .
