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    #1

    Exclamation Modal verbs

    I would like know the use of three modal verbs i.e. ought to, have to and must. Are they interchangable? For example: I must obay the advice of my parents.
    Can I write: I ought to/have to obay the advice of my parents.

  1. Soup's Avatar
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    #2

    Re: Modal verbs

    Must expresses certainty. Should/ought to expresses probability.

    Must is used mostly to talk about the feelings and wishes of the speaker and hearer. Have (got) to is used mostly to talk about obligations that come from outside. For example from laws, regulations, agreements and other people's orders.

    Sources
    Learn English - Grammar - auxiliary verbs
    Learn English - Grammar - auxiliary verbs

  2. bhaisahab's Avatar
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    #3

    Re: Modal verbs

    Quote Originally Posted by Manas Ranjan Mallick View Post
    I would like know the use of three modal verbs i.e. ought to, have to and must. Are they interchangable? For example: I must obay the advice of my parents.
    Can I write: I ought to/have to obay the advice of my parents.
    Hi,
    If you say "I must obey the advice of my parents". This is an imperative, you are obliged to obey.

    "I have to...". is slightly more equivocal but still strong.

    "I ought to...". means that you should but maybe you won't.

  3. Dawood Usmani's Avatar
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    #4

    Re: Modal verbs

    Quote Originally Posted by Manas Ranjan Mallick View Post
    I would like know the use of three modal verbs i.e. ought to, have to and must. Are they interchangable? For example: I must obay the advice of my parents.
    Can I write: I ought to/have to obay the advice of my parents.
    A simple defintion of the difference between have to and must -( that is except when you are using the other forms of 'have to' to make up for the fact that must has got parts missing) is that have to suggests external authority.

    We have to use watering cans and not hosepipes at the moment because the local council says we can't use hosepipes.

    Must has the sense of internal compulsion - in other words you tell yourself that something is necessary. Following on from my pervious sentence, I could say:

    I must remember to buy a watering can if I want to water my garden.

    We next come to 'ought to' where the obligation is if you like a moral one because this is the voice of your conscience telling you the right thing to do. To continue with my gardening theme (sorry about that) I could say: I ought to put my hosepipe away as use of it is now banned but sometimes I would really like to use it at night when no one can see me!

    Please see the link below to get further help.
    Modal Auxiliary Expressions: should, ought to, must, have to

    Now, you should be able to answer to your question yourself. Write back your answer, then we'll see if it's correct.

    Hope this has helped.
    Best regards!
    Dawood

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