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quantity作主語時謂語用單數(shù)還是復(fù)數(shù)

1. 若單獨用quantity作主語，謂語動詞用單數(shù)。如：

It is used to emphasize that the quantity is very large. 它用于強調(diào)數(shù)量很大。

2. 若用于a great (large, small) quantity of…結(jié)構(gòu)，其后主要接不可數(shù)名詞，但有時也接復(fù)數(shù)名詞；這類結(jié)構(gòu)用作主語時，其謂語的數(shù)原則上與其中的名詞的數(shù)保持一致。如：

There are a small quantity of apples in the house. 房子里有少量的蘋果。

A large quantity of food was on the table. 大量的食物擺在桌上。

3. 若該結(jié)構(gòu)變成(large) quantities of…這樣的形式，則當(dāng)它用作主語時，其謂語動詞一律用復(fù)數(shù)(與其中名詞的數(shù)無關(guān))。如：

Huge quantities of oil were spilling into the sea. 大量的石油滲到海里。

Large quantities of rice have been destroyed in the flood. 大量的莊稼在洪水中被毀壞了。