5.“one and a half＋復(fù)數(shù)名詞”與“a＋單數(shù)名詞＋and a half”作主語

此時(shí)國(guó)內(nèi)不少書認(rèn)為，這兩個(gè)結(jié)構(gòu)作主語，謂語均用單數(shù)。如：

One and a half months has passed. / A month and a half has passed. 已經(jīng)過去了一個(gè)半月。

但是，國(guó)外一些詞書則認(rèn)為，謂語動(dòng)詞的數(shù)取決于這兩個(gè)結(jié)構(gòu)中名詞的數(shù)：

One and a half months have passed. / A month and a half has passed. 已經(jīng)過去了一個(gè)半月。

6.“the [a] number of+名詞”作主語

該結(jié)構(gòu)若用定冠詞，其后謂語用單數(shù)；若用不定冠詞，其后謂語用復(fù)數(shù)：

The number of students is 4000. 學(xué)生人數(shù)為4000。

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

注意類似結(jié)構(gòu)：

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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