I was wondering if you guys could help me with this.
A: A large number(amount) of something
B: large numbers (amount) of something
Do you guys use A and B interchangeably or is there a certain rule I should follow in using them each?
A large number of something is not a large amount of it. It is many of the somethings. "Large numbers (of)" is nothing more than the plural of "a large number (of)".
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A large number of something is not a large amount of it. It is many of the somethings. "Large numbers (of)" is nothing more than the plural of "a large number (of)". "A large number (of)" is construed as plural, as if it was "many". A large number of seagulls descend upon the dump every morning. Large numbers of seagulls do so, too. I don't see much of a difference.
Large numbers of tou
A large number of people attended the concert.
Large numbers of people attended the concert.
We use large amounts of petroleum every day for industry and transportation.
W use a large amount of petroleum every day for industry and transportation.
Those sentences are natural; both forms are used.