quantity作主語(yǔ)時(shí)謂語(yǔ)用單數(shù)還是復(fù)數(shù)

1. 若單獨(dú)用quantity作主語(yǔ)，謂語(yǔ)動(dòng)詞用單數(shù)。如：

It is used to emphasize that the quantity is very large. 它用于強(qiáng)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(shí)也接復(fù)數(shù)名詞；這類結(jié)構(gòu)用作主語(yǔ)時(shí)，其謂語(yǔ)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(yǔ)時(shí)，其謂語(yǔ)動(dòng)詞一律用復(fù)數(shù)(與其中名詞的數(shù)無(wú)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。