The difference between A great deal and Much
When used as adverbs, a great deal means very much, whereas much means to a great extent.
A great deal is also noun with the meaning: a large amount.
Much is also determiner with the meaning: a large amount of.
Much is also pronoun with the meaning: a large amount or great extent.
Much is also adjective with the meaning: large, great.
check bellow for the other definitions of A great deal and Much
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A great deal as an adverb (idiomatic):
Very much; to a great extent; a lot; lots.
Examples:
"We had a great deal more money afterwards."
"They had a great deal less than we had."
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A great deal as a noun (idiomatic):
A large amount; a lot.
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Much as an adjective (obsolete):
Large, great.
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Much as an adverb:
To a great extent.
Examples:
"I don't like fish much."
"He is much fatter than I remember him."
"He left her, much to the satisfaction of her other suitor."
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Much as an adverb:
Often; frequently.
Examples:
"Does he get drunk much?"
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Much as a pronoun:
A large amount or great extent.
Examples:
"From those to whom much has been given much is expected."