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但是有些主語由于本身具有單數和復數兩種可能, 它的謂語到底用單數還是復數, 要看具體的語境(多數情況是看其后面詞語的單復數)：

1. a. Who is your brother? 誰是你的兄弟?

b. Who are your brothers? 哪些是你的兄弟?

2. a. What he said is quite correct. 他所說的完全 正確。

b. What he left me are only a few old books. 他 給我留下的只是幾本舊書。

4. 集合名詞作主語, 謂語的數如何確定

1. His family ______ a small one.

2. His family ______ fat and short.

A. is, is                    B. are, are               C. is, are                  D. are, is

此題應選C。family 是一個集合名詞, 具有單數(側重指整體)和復數(側重指個體)兩種可能。 類似這種用法的詞主要的有：team(隊, 隊員), class(班, 班上的全體學生), crowd(人群), government(政府), crew(乘務員), committee(委員會, 委員們), audience(聽眾)等：

1. a. This class consists of 45 students. Mr Green

teaches it. 這個班45個學生, 由格林先生教。

b. This class are all diligent. Mr Green teaches them. 這個班的學生都很用功, 由格林先生教。

2. a. The team is the best in the league. 這個隊在 聯賽中打得最好。

b. The football team are having baths. 足球隊隊 員們在洗澡。

3. a. It was late, but the audience was increasing. 時間很遲了, 但聽眾人數卻在增加。

b. The audience were all moved to tears. 聽眾都 感動得流了淚。

但是并不是所有的集合名詞都具有以上兩種用法：

1. 有的集合名詞總是用作單數(不可數)：clothing 衣服, poetry 詩歌, baggage / luggage 行李, furniture 家俱, machinery 機械, scenery 景色, jewellery 珠寶 等

2. 有的集合名詞總是表示復數意義(但不用復數形式)：

people 人, police 警察, cattle 牲口等

5. 這類結構的謂語應與哪個主語保持一致

A library wit five thousand books ______ to the nation as a gift.

A. is offered             B. has offered          C. are offered          D. have offered

此題應選A。用連詞and連接的兩個并列主語, 其謂語要用復數, 但是若主語后跟有with, like, but, except, besides, including, together with, along with, as well as, morethan, no less than, rather than等連接的另一個名詞, 其謂通常要與前面一個主語保持一致：

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