a quantity of 谓语单数还是复数

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。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。例如：A large quantity of beer was sold out。A large quantity of blouses were on sale。

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。

可数名词和不可数名词的不定量表示：some、any、plenty of、a lot of、a large quantity of等能同进修饰可数名词与不可数名词。例如：The ladey has stored a large quantity of vegetables for the winter。这位女士储存了大量蔬菜，供冬天食用。结构分析：The ladey是主语，hasstored是谓语（现在完成时），a large quantity of vegetables是宾语，for the winter是状语。

The farmer has stored a large quantity of hay for the cows。这个农民储存了许多干草，供奶牛吃。There are plenty of storybooks for the children。有许多故事书可供孩子们阅读。结构分析：There be+名词词组+状语。