3. 下列不定代詞作復數(shù)用：“（a）few, many, several，both”等。
         Few (of the guests ) were familiar to us . 沒幾個（客人）是我們熟識的。
         Both / Both (of ) these are interesting . 兩部影片都有趣。
4下列代詞須視其“具體所指”來決定謂語動詞的單、復數(shù)：
     1）“what ,which ,who ,whose ”等。
                    Who is your brother ?你兄弟是誰？
                    Who are League Members .哪些是團員？
     2） “all, some, more, most, any, none, a lot(of ), lots (of ),”等。
                    All (of the students) are working hard .（所有的學生）都在用功。
                    All (of the paint) is fine .（這些油漆）都很好。
     3） “half(of), plenty (of), the rest(of), (a)part(of), the remainder(of )余下的）”等視被修 飾詞的單復數(shù)而定。
            Half of the apples are bad .蘋果中有一半是壞的。
            Half of the apple is bad .這只蘋果壞了一半。

Ⅲ. “數(shù)詞”、“數(shù)量、單位”等詞語作主語時：
1. 表示“運算”的數(shù)詞通常作單數(shù) 。

Ten times four makes (make) forty . 十乘以四得四十。
2.表“時間、距離、金額、度量衡”等的詞語，作“整體”看時作單數(shù)用，側(cè)重指“若干   單 位”時作復數(shù)用。
             Twenty years is not a long time. 二十年光陰，彈指一揮間。
               Twenty years have passed since he left. 他離開已二十個年頭了。
3.“分數(shù)、百分數(shù)”通常依其“具體所指”來決定單、復數(shù)。
         About 40 percent / two-fifths of the books here are (is) worth reading.    

               這些書中百分之四十/五分之二值得讀。
          Only sixty percent / three-fifths of the work was done yesterday.              

         昨天只干完了百分之六十/五分之三的工作。
4. "a number of (許多)/ a variety of (各式各樣) "+復數(shù)名詞，常作復數(shù)用。
  A number of students in this class are (is) from Sichuan.                  

這個班有不少同學來自四川。
           There are a variety of toys in this shop.這家商店有各種各樣的玩具。

l         注意:

“the number(數(shù)目)/ the variety(種類)”+ of + 復數(shù)名詞，作單數(shù)。
The number of students in this college has doubled . 這所大學的學生人數(shù)翻了一番。
The variety of goods in this shop is rich . 這家商店貨物品種豐富。

IV．單、復數(shù)同形或易混淆的詞作主語時：

1.一些以“-s”結尾表示學科、疾病和游戲的名詞（AIDS, athletics, draughts, politics, economics, mathematics, measles, physics, statistics）等作主語，謂語用單數(shù)形式。

Mathematics seems easy to me .我似乎覺得數(shù)學不難。

2. “works工廠，means方法，series系列，species物種，aircraft飛機”等名詞的單復數(shù)同形，要從上下文判斷其具體意義來決定謂語動詞的單、復數(shù)。

This works was (These works were) built two years ago .

這（幾）家工廠是兩年前修建的。
Every means has (All means have) been tried . 各種辦法都試過了。

l         注意:

這類名詞通常還有“fish ,deer ,sheep, plastics, manners(禮貌) , whereabouts (行蹤) ”等。（但news（消息、新聞）是不可數(shù)名詞，通常只作單數(shù)用。）