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    #1

    must / have to / shouldn't ...?

    Hello dear teachers
    I have these confusing questions regarding some model verbs.I posted my answers but I am not sure whether they are correct or not.

    1- Teacher to student: " You ............. study so hard. The exam is quite easy to pass." must
    2-Doctor to patient : " You ............. eat so many sweets and you .......... do more exercises." mustn't / must
    3- I think young people ............. travel alone. it's too dangerous. shouldn't
    4- Listen to me, boys! You ................. touch it, it's very hot! mustn't
    5- My parents think I ............... watch less TV and study more. have to

    Can't we use " mustn't " in question number 3 ?
    And can't we use " shoudn't " in question number 4 ?
    and finally what is the difference between " mustn't " and " needn't "?

    best regards
    Last edited by herbiji; 09-Mar-2009 at 22:54.

  1. tareq10's Avatar
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    #2

    Re: must / have to / shouldn't ...?

    Although I know the difference between the modal verbs very well, I can't even use them correctly.


    Have to is used when the obligation comes from someone else. outer obligation

    E.g: The principal told us we…have to….wear school uniform.

    must is used when the obligation comes from the speaker.

    E.g: I……must……..go home-my mother is waiting for me.

    should is used to give an advice.

    E.g: You……should…………see your doctor. You don't look well.


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    #3

    Re: must / have to / shouldn't ...?

    Not a teacher.

    1- Teacher to student: " You ............. study so hard. The exam is quite easy to pass."
    shouldn't (should be negative, and it's advice so should)
    2-Doctor to patient : " You ............. eat so many sweets and you .......... do more exercises."
    mustn't / must (I would use shouldn't/should because doctors don't have authority, but must might be ok. Personally mustn't sounds stuffy.)
    3- I think young people ............. travel alone. it's too dangerous.
    shouldn't (not must because it says think.)

    4- Listen to me, boys! You ................. touch it, it's very hot!
    mustn't
    (Correct, I believe. But sounds awkward to my American ears. 'Must not' would be better.)
    5- My parents think I ............... watch less TV and study more.
    I would say should because it says think. Should implies advice. However, because it's parents they have the authority to demand, so it could be have to.


    must is used for obligations being imposed by the speaker. need is by outsiders.
    'You must not bring anything.' is a demand to not bring anything.
    'You need not bring anything.' is just letting the other person know that they don't have to bring anything even if conventions would dictate that they bring something.

  2. #4

    Re: must / have to / shouldn't ...?

    Being a single da of 6 kids I say it is definitely: have to watch less TV! with emphasis on the the authority aspect.

    My Irish ears require must not as well.

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    #5

    Re: must / have to / shouldn't ...?

    But, if a doctor feels that the situation is so serious, out of control and the patient's health is getting worst, he might say: you must take this medicine immediately.

    I think that modals are dependent, that is, more than one modal can be used in the same situation.

    T
    Last edited by tareq10; 09-Mar-2009 at 23:59.

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    #6

    Re: must / have to / shouldn't ...?

    Quote Originally Posted by chris dolphy View Post
    not a teacher.

    1- teacher to student: " you ............. Study so hard. The exam is quite easy to pass."
    shouldn't (should be negative, and it's advice so should)
    since it should be negative,i think it's better to use " don't have to " because it is used when there is no necessity to do something .i don't think a teacher would advice a student not to study hard, so there is not advice here.. Am i correct ?
    2-doctor to patient : " you ............. Eat so many sweets and you .......... Do more exercises."
    must is used with other people orders...etc so i think the doctor here is ordering the patient to avoid eating so many sweets and do more exercises. Right ????

    mustn't / must (i would use shouldn't/should because doctors don't have authority, but must might be ok. Personally mustn't sounds stuffy.)

    [/i][/color]
    0
    Last edited by herbiji; 26-Mar-2009 at 08:37.

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    #7

    Re: must / have to / shouldn't ...?

    [quote=herbiji;450449]Hello dear teachers
    I have these confusing questions regarding some model verbs.I posted my answers but I am not sure whether they are correct or not.

    1- Teacher to student: " You ............. study so hard. The exam is quite easy to pass." must the teacher feels that it is necessary

    2-Doctor to patient : " You ............. eat so many sweets and you .......... do more exercises." mustn't the doctor feels that it is necessary / should gives an advice

    3- I think young people ............. travel alone. it's too dangerous.
    mustn't he thinks it's dangerous.
    4- Listen to me, boys! You ................. touch it, it's very hot!mustn't also dangerous

    5- My parents think that I ............... watch less TV and study more. have to outer obliation, from his parents


    mustn't ...It's very necessary not to do something. you're obliged to do.

    E.g: you musn't cross the road when the traffic lights turn red.

    needn't ...simply, means you don't need to do something.

    E.g: you needn't bring this book with you. you don't need to do it but (you can if you like)


    HOPE YOU THE BEST
    Last edited by tareq10; 10-Mar-2009 at 00:26.


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    #8

    Re: must / have to / shouldn't ...?

    After reading herbiji answer to #1 I would agree with him. Either don't need, don't have to, or shouldn't would be acceptable, but 'don't need' is probably best. Never 'must not' though. If the students WANT to study a lot, I don't think any teacher would stop them :)

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    #9

    Re: must / have to / shouldn't ...?

    Quote Originally Posted by herbiji View Post
    1- Teacher to student: " You ............. study so hard. The exam is quite easy to pass." must
    Say:
    You need not study so hard

    or

    You don't need to study so hard
    Quote Originally Posted by herbiji View Post
    2-Doctor to patient : " You ............. eat so many sweets and you .......... do more exercises." mustn't / must
    Maybe "must not" for the first one. Definitely "should not" for the second one.

    Quote Originally Posted by herbiji View Post
    3- I think young people ............. travel alone. it's too dangerous. shouldn't


    Quote Originally Posted by herbiji View Post
    4- Listen to me, boys! You ................. touch it, it's very hot! mustn't
    (I would say "must not".)

    Quote Originally Posted by herbiji View Post
    5- My parents think I ............... watch less TV and study more. have to
    Say:
    My parents think I should watch less TV and study more.
    You may now discuss my answers, but you must not be impolite.

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