a large quantity of 和large quantities of 和a large
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a large quantity of 后面可接可数名词或不可数名词,接不可数名词时谓语动词用单数,接可数名词复数时谓语动词用复数(少数人认为也要用单数)

large quatities of 后面接可数或不可数名词时谓语动词多要用复数(因为quantities本身用了复数)

A large quantity of milk was reported not to reach the standard

A largr quantity of students don't like English.

Large quantities of water are wasted every year.

amount 一般后面接不可数名词,所以a large amount of 后面谓语动词用单数,而large amounts of 后面接不可数名词时谓语动词也要用复数

A large amount of money has been wasted

Large amounts of money have been wasted.