a quantity of+可数名词复数、谓语动词用复数;a quantity of+不可数名词、谓语动词用单数。即修饰可数或不可数名词均可,作主语时采取就近一致的原则,其谓语动词通常与短语中of后面的名词的数保持一致。
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Quantities of cash have been withdrawn from the bank.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。
a quantity of谓语用单数还是复数a quantity of+可数名词复数、谓语动词用复数;a quantity of+不可数名词、谓语动词用单数。
若单独用quantity作主语,谓语动词用单数。
如:It is used to emphasize that the quantity is very large。
它用于强调数量很大。若该结构变成(large)quantities of…这样的形式,则当它用作主语时,其谓语动词一律用复数。
如:Huge quantities of oil were spilling into the sea。大量的石油渗到海里。
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