2. Have to is used to make a distinction between habitual or repeated obligation,
and non-habitual obligation. When there is the idea of repetition we use ordinary verb-forms, with do in questions and negatives.
E.g.: I dont usually have to work on Sundays. Do you often have to speak French in your job?
3. When people are talking about one thing that they are obliged to do, it is more
usual to use got-forms. E.g.: I havent got to work tomorrow.
Have you got to do any interpreting this week? 4.
Got-forms are unusual in the past, and are replaced by ordinary verb-forms of infinitive and participles.
E.g.: Did you have to go to Church on Sundays when you were a child?
5. To talk about the future, both have to and will have to are common.
E.g.: Ive got to get up early tomorrow. Were going to Devon.
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m. Used to
Used to expresses the idea of a customary or habitual action in the past.
E.g.: it used to take weeks to cross the ocean by ship.
n. be to
Be to is used to indicate plans and arrangements.
E.g.: I am to telephone him tomorrow at 5:00.
It has been arranged that I will telephone him tomorrow.
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o. Need
Need is used to express immediate necessity in the future.
E.g.: you
needn’t pay for the bill.
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http:ismailmidi.comberita-168-must-vs-have-to.html
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George E. Wishon, Julia m. Burks, Let’s write English revised edition, … p. 234.
1. The ordinary forms of need are much more common than the modal auxiliary forms. The only modal form which is often used is neednt.
E.g.: You neednt try to explain. Do you need to stay this evening?
When the modal forms are used, they usually refer to immediate necessity; they are often used to ask for or give permission -usually permission not to do
something. Ordinary verb forms are more common when we talk about habitual, general necessity. Compare:
1 We neednt book a table. The restaurant wont be full. Need I do the washing up? Im in a hurry.
2 Do you need to get a visa if you go to Mexico? 2. Present tense forms of need can be used to talk about the future, but will
need to is often used to give advice. Compare: E.g.: 1 Need I come in early tomorrow? Or, Do I need to come in...
I need to get the car service soon. 2 Youll need to star work soon if you want to pass your exams
3. Affirmative modal forms are possible after negative verbs, and in sentences which express doubt or negative ideas.
E.g.: I wonder if we need take sleeping-bags. I dont think he need go just yet.
The only thing you need do is fill in this form. You dont need to do anything else
Note that these affirmative modal forms are mainly used in a formal style. In informal usage we would probably use the ordinary forms.
E.g.: I wonder if we need to take sleeping-bags. I dont think he needs to go just yet.
The only thing you need to do is fill in this form.
