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5.“one and a half＋復數名詞”與“a＋單數名詞＋and a half”作主語

此時國內不少書認為，這兩個結構作主語，謂語均用單數。如：

One and a half months has passed. / A month and a half has passed. 已經過去了一個半月。

但是，國外一些詞書則認為，謂語動詞的數取決于這兩個結構中名詞的數：

One and a half months have passed. / A month and a half has passed. 已經過去了一個半月。

6.“the [a] number of+名詞”作主語

該結構若用定冠詞，其后謂語用單數；若用不定冠詞，其后謂語用復數：

The number of students is 4000. 學生人數為4000。

A number of people were absent from the meeting. 許多人開會缺席。

注意類似結構：

The variety of goods in this shop is rich. 這家商店的品種豐富。

A variety of books have been published. 已出版了各種各樣的書。

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