2． 有些名詞用作可數(shù)名詞時(shí)，表示個(gè)體的人或物；而用作不可數(shù)名詞時(shí)，則表示一類的人或物的集合體。例如：
My grandfather’hair is grey．(泛指頭發(fā))
she has got grey hairs．(指一根根頭發(fā))
這些名詞的單復(fù)數(shù)形式有不同的含義，再如：water水，waters水域；danger危險(xiǎn)，a danger一個(gè)危險(xiǎn)人物；advice(勸告)，advices(消息)；ann(手臂)，arms(軍火)；cloth(布)，clothes(衣服)； custom(習(xí)慣)，customs《海關(guān))等。
考場(chǎng)思維訓(xùn)練
1 Four are visiting our school now, two of them are .
A. Russians ; policemen B. Russians ; policeman C. Russian man; policemen D. Russian; policemen
1．A解析：考查名詞的復(fù)數(shù)形式。Russian的復(fù)數(shù)形式是Russianso
2 You know I have no for foreign languages.
A. knowledges B. gift
C. character D. characters
2．B解析：sift天賦。knowledge是不可數(shù)名詞。
3 Perhaps we need to clear away these books to make for our new students.
A. place B. area C. room D. space
3．C解析：這里room用作不可數(shù)名詞，表示“空間”。
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