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11.10 'It isn't advisable ...'/'It isn't necessary ...'/it's forbidden ...'

11.10A 'It isn't advisable' - 'It's forbidden': 'a scale of choice' [> LEG 11.54]

We can say what, in our opinion, is not advisable, or what is forbidden on a scale which shows how much choice there is. We use the following words [compare > 11.9A]:

1 Shouldn't and oughtn't to (= in my opinion it isn't advisable, but there is some choice): You shouldn't drive too fast. You oughtn't to drive too fast. (= That's my advice, but ignore it if you want to.)

2 Had better not is stronger, even a warning: You'd better not lose your passport.(= That's my urgent advice. There may be consequences if you ignore it.)

3 Can't and mustn't (= you have no choice: it's forbidden [> 11 3B]): You can't stop on a motorway. You mustn't stop on a motorway. (= it's against the law)

Write: Match A and B to show the effect of the verbs. B: a) 'not advisable' – warning b) 'forbidden' – law c) 'not advisable' – personal d) 'not possible'

A: 1 You mustn't park near a zebra crossing. B 2 You shouldn't eat so much chocolate cake… 3 You can't use that footpath. It's closed… 4 You had better not be late for the lecture. …

11.10B 'Mustn't', 'needn't', 'don't have to', 'haven't got to' [> LEG 11.55]:

1 Must, have to, have got to generally mean the same in the affirmative [> 11.9B]. But mustn't never means the same as don't have to/haven't got to.

2 Mustn't means 'it's forbidden' [> 11.3B, 11.5B]: Life belts must not be removed! (no choice)

3 We can use needn't, don't have to and haven't got to in place of each other to mean 'it isn't necessary': I needn't/don't have to/haven't got to go to the office tomorrow, (choice)

Write: Supply mustn't or needn't/don't have to/haven't got to.

1 You don’t have to work such long hours. You won't earn any more. 2 They … wear a uniform. It's not obligatory. 3 She …leave the office last. She can go when she's ready. 4 You really … waste money like that. It worries your parents. 5 Visitors … enter the laboratories without permission. 6 We … always wear protective clothing in the factory. 7 You … go to the party if you don't want to. Nobody's forcing you. 8 He … do the job today, as long as it gets done some time this week. 9 Surely we … leave home yet. It's far too early to go to the station. 10 Passengers … smoke in the toilets.11 'Are you going to read the report?' - 'No, I … It's confidential.' 12 'Are you going to read the report?' - 'No, I … I already know what it says.' 13 You … attend the meeting tomorrow. It's for union officials only. 14 You … attend the meeting tomorrow. It's not important. 15 You … forget to pay the electricity bill, or we'll be cut off. 16 We … worry about Tom. He's just phoned to say he's all right.

11.10C 'Needn't have', 'didn't have to', 'didn't need to' [> LEG 11.57.1]

1 These sentences mean 'I went there, but it wasn't necessary':

I needn't have gone to the office yesterday (but I went). I didn't have to/didn't need to go to the office yesterday (but I went), (have and need are stressed in speech)

2 Compare didn't have to and didn't need to without stress:

I didn't have to go to the office yesterday. I didn't need to go to the office yesterday. (= I knew in advance it wasn't necessary to go to the office and I didn't go.)

Write: Supply needn't have or didn't have to and the correct form of the verbs in brackets. 1 I needn’t have phoned the plumber. I learnt later that John had already phoned him. (phone) 2 I … the plumber. I knew John had already phoned him. (phone) 3 You … your umbrella after all. It hasn't rained, (bring) 4 The forecast was for fine weather so I knew I … my umbrella, (bring) 5 I … these clothes. I didn't know they had already been washed, (wash) 6 I … a meal last night because we went out and the food I prepared was uneaten, (cook)

11.10D 'Shouldn't have' and 'oughtn't to have' [> LEG 11.57.2] We often use shouldn't have (done) or oughtn't to have (done) to criticize our own actions or someone else's: I/You shouldn't have paid/oughtn't to have paid the plumber in advance.

Write: Respond to these statements with shouldn't have done that or oughtn't to have done that.

1 I had to stop on the motorway You shouldn’t have done that. 2 John read your letter … 3 Frank and Jane sat in the sun all day … 4 Jane left the front door unlocked … 5 I borrowed your car this morning…

11.10E Context Write: Put in didn't need to, must not, shouldn't have and should have. HOW TO CATCH YOUR MAN 'Candidates 1 must not attempt more than four questions.' The young candidate for the law exam was very well-prepared and2 …be told what to do. The results were brilliant. The paper achieved the third highest score out of 7,000 papers! But the examiners were puzzled. Mr Paul Blake 3 … achieved such a high score. This candidate had failed this exam three times already. Then the truth became known. The candidate was not Mr Paul Blake, as it4 … been. His wife had gone instead. Mrs Alison Blake, a brilliant lawyer, had dressed up as a man. The fraud was discovered because an examiner had noticed that the candidate was visibly pregnant!

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