Definition of much determiner from the Oxford Advanced American Dictionary

      

    much

     determiner,pronoun
    determiner, pronoun
    NAmE//mʌtʃ//
     
     
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  1. 1  used with uncountable nouns, especially in negative sentences to mean “a large amount of something,” or after “how” to ask about the amount of something. It is also used with “as,” “so,” and “too.” I don't have much money with me. “Got any money?” “Not much.” How much water do you need? How much is it (= What does it cost)? Take as much time as you like. There was so much traffic that we were an hour late. I've got far too much to do.
  2. 2(formal) I lay awake for much of the night.
  3. 3(formal) There was much discussion about the reasons for the failure.
  4. Idioms the same Please help me get this job—you know I would do as much for you. “Roger stole the money.” “Ithought as much.”
    as much as somebody can do
     
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    used to say that something is difficult to do No dessert for me, thanks. It was as much as I could do to finish the main course.
    not much of a…
     
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    not a good… He's not much of a tennis player.
    used to introduce something positive or definite I'll say this much for him—he never leaves a piece of work unfinished.
Grammarmuch / a lot of / lots ofMuch is used only with uncountable nouns. It is used mainly in questions and negative sentences:Do you have much free time? How much experience do you have? I don’t have much free time.In statements a lot of or lots of (informal) is much more common:She earns a lot of money.You can also use plenty (of). These phrases can also be used in questions and negative sentences.A lot of/lots of is still felt to be informal, especially in writing, so in formal writing it is better to use much, a great deal of, or a large amount of.Very much and a lot can be used as adverbs:I miss my family very much. I miss very much my family. I miss my family a lot. Thanks a lot.In negative sentences you can use much:I didn’t enjoy the movie (very) much.
See the Oxford Advanced Learner's Dictionary entry: much