American English

Definition of will modal verb from the Oxford Advanced American Dictionary

      

    will

     modal verb
    modal verb
    NAmE//wəl//
     
    , NAmE//əl//
     
    , NAmE//l//
     
    , NAmE//wɪl//
     
     
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  1. 1used for talking about or predicting the future You'll be in time if you hurry. How long will you be staying in Paris? Fred said he'd be leaving soon. By next year all the money will have been spent.
  2. 2used for showing that someone is willing to do something I'll check this letter for you, if you want. They won't lend us any more money. He wouldn't come—he said he was too busy. We said we would keep them.
  3. 3used for asking someone to do something Will you send this letter for me, please? You'll water the plants while I'm away, won't you? I asked him if he wouldn't mind calling later.
  4. 4used for ordering someone to do something You'll do it this minute! Will you be quiet!
  5. 5used for stating what you think is probably true That'll be the doctor now. You'll have had dinner already, I suppose.
  6. 6used for stating what is generally true If it's made of wood it will float. Engines won't run without lubricants.
  7. 7 used for stating what is true or possible in a particular case This jar will hold a pint. The door won't open!
  8. 8used for talking about habits She'll listen to music, alone in her room, for hours. He would spend hours on the telephone. If you put extra stress on the word will or would in this meaning, it shows that the habit annoys you:He will talk with his mouth full, even though he knows I don't like it. Grammarmodal verbsThe modal verbs are can, could, may, might, must, ought to, shall, should, will, and would. Dare, need, have to, and used to also share some of the features of modal verbs.Modal verbs have only one form. They have no past or present participles and do not add -s to the 3rd person singular form:He can speak three languages. She will try and visit tomorrow.Modal verbs are followed by the infinitive of another verb without to. The exceptions are ought to and used to:You must find a job. You ought to stop smoking. I used to smoke, but I quit two years ago.Questions are formed without do/does in the present or did in the past:Can I invite Mary? Should I have invited Mary?Negative sentences are formed with not or the short form -n’t and do not use do/does or did:You shouldn't invite Mary. The error will not have affected our results.You will find more help with how to use modal verbs at the dictionary entries for each verb. Grammarshall / willIn modern English, the traditional difference between shall and will has almost disappeared, and shall is not used very much at all. Shall is now used only with I and we, and often sounds formal and old-fashioned. People are more likely to say:I’ll (= I will) be lateandYou’ll (= you will) have your turn next.
See the Oxford Advanced Learner's Dictionary entry: will