To tell you the truth, people get these mixed up all the time and their usage is sometimes blurred. But, as a general rule, "A great deal of" and " a good deal of " are used with uncountable nouns. A great deal of money was stolen from the bank.
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MaroldI've come across a lot of times the phrase: a great deal of and I still don't know whether it is used either with countable nouns or uncountable nouns or even both countable and uncountable.Uncountable
Countable.
And what about a large number of
In conclusion, would it be possible to use: a
in the official Cambridge guide to IELTS page 39 we have a section as follow, when a great deal of changes were taking place. why is that???