LONGMAN ENGLISH GRAMMAR PRACTICE

11 Modal auxiliarles and related verbs11.911.9AStudy:Ш'It's advisable ...'/'It's necessary ...''It's advisable' -* 'It's necessary': 'a scale of choice' [> LEG 11.47]We can say what, in our opinion, is advisable or necessary on a scale which shows how muchchoice there is. We use the following words to give advice or say what is necessary:1 Should and ought to (= in my opinion it's advisable, but there is some choice):You should see a doctor. You ought to vote in the next election.(= That's my advice, but ignore it if you want to.)2 Had better is stronger, even a warning: You'd better see a doctor.(= That's my urgent advice. There may be consequences if you ignore it.)3 Have to, have got to (less formal) and must (= in my opinion, you have no choice):You have to/have got to/must see a doctor.(= That's the strongest advice I can give you. Don't ignore it!) [compare > 11.1 OA]Write:Tick the sentences that mean 'it is/it was advisable' or 'it is/it was necessary'.1 You should listen more carefully.2 I must get to the meeting before 7.30.3 I'd better hurry, or I'll be late.4 They should have taken umbrellas with them.5 She had to complete the test in ten minutes.6 We ought to have stopped for a meal on the way.advisablenecessary11.9B 'Must', 'have to' and 'have got to' [> LEG 11 48]1 We often use must, have to and have got to in place of each other, but sometimes not.2 We tend to prefer must.- when we refer to ourselves (with l/we): I really must weed this garden.- with you to express urgency: You must phone home at once.- in public notices, etc.: Cyclists must dismount.- (= Can't you stop yourself?): Must you interrupt?- pressing invitations or advice: You must come and see us. You must repair that fence.3 We often use have to (or have got to) to refer to outside authority:I have (got) to pay my road tax soon.Write:Supply the forms must or have (got) to which 'feel right' in these sentences.Sometimes more than one form is possible.1 We really do something about having this house decorated.2 We pay this electricity bill by the end of the week.3 You write and let us know you've arrived safely.4 I be at my desk by 9.00 every morning.5 We always clock in when we arrive at work.6 ALL VISITORS REPORT TO THE DUTY OFFICER.7 you always slam the door when you come in?8 You really come and see the new extension to our house some day.172