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aquantities of:修饰不可数名词时,谓语用复数，例如Quantities of food (nuts) were on the table;a quantity of:修饰不可数名词时,谓语用单数。例如A large quantity of beer was sold out。
quantities of和a quantity of的区别
quantities of和a quantity of都可以修饰可数名词和不可数名词，区别在于：
quantities of在修饰不可数名词，并且和后面的名词一起做主语时，谓语由它决定，也就是用复数。
a quantity of修饰不可数名词，并且和名词一起做主语时，谓语动词由后面的名词决定，也就是用单数。
例如：Quantities of energy are saved today. (今天大量的能源被节约)
A quantities of energy are saved today.
Quantities of cash have been withdrawn from the bank.
(大量的现金已经被从银行取出)
Aquantity of ready-use 35 mm ammunition in clips is also carried.
一批准备使用35毫米弹药在剪辑，也获得通过。
其他时候俩者可互换。
The milk carton, in turn, has a quantity of milk inside it.
=The milk carton, in turn, has quantities of milk inside it
这盒牛奶，再进一步，它里面牛奶有一个量。
quantity相关短语
fundamental quantity
基本量
relative quantity
相对量，相对值
unknown quantity
未知量，未知数
variable quantity
可变参量，可变量，变量
complex quantity
复数, 复量
constant quantity
n. 1.恒量，常数
definite quantity
定量