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■“a number of +復(fù)數(shù)名詞”意為“許多”，作主語時(shí)，謂語動(dòng)詞用復(fù)數(shù)；“the number of +復(fù)數(shù)名詞”意為“……的數(shù)目”，作主語時(shí)，謂語動(dòng)詞用單數(shù)。如：

The number of people invited was fifty, but a number of them were absent for different reasons. 被邀請(qǐng)的人是五十個(gè)，但由許多人由于不同原因缺席了。

■“a lot of /lots of /plenty of /a large quantity of /a large amount of +名詞”作主語，謂語動(dòng)詞的數(shù)與名詞的數(shù)一致；如：

A large amount of damage was done in a very short time. 在短時(shí)間內(nèi)造成了很大的損害。

A great amount of our investments are in property. 我們大量的錢都投資到房地產(chǎn)中。      

但“(large /huge) quantities /amounts of名詞”作主語，謂語動(dòng)詞一般用復(fù)數(shù)。如：

Large amounts of money were spent on the bridge. 那座橋耗費(fèi)了大量金錢。

■“a +單數(shù)名詞+and a half”和“one and a half +復(fù)數(shù)名詞”做主語，謂語動(dòng)詞用單數(shù)形式。如：

One and a half pears has been left on the table. 盤子里剩下一個(gè)半梨子。

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