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■“a number of +復數名詞”意為“許多”，作主語時，謂語動詞用復數；“the number of +復數名詞”意為“……的數目”，作主語時，謂語動詞用單數。如：

The number of people invited was fifty, but a number of them were absent for different reasons. 被邀請的人是五十個，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，謂語動詞的數與名詞的數一致；如：

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

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

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

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

■“a +單數名詞+and a half”和“one and a half +復數名詞”做主語，謂語動詞用單數形式。如：

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

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