1.物質(zhì)名詞(water, air等)在用于一般意義時(shí)不加冠詞: Water boils at 100 centi degree. 水在攝氏100度沸騰。 We can't live without air. 沒有空氣我們就不能生活。 They make high—quality steel. 他們制造優(yōu)質(zhì)鋼。 Snow covered the ground. 地上被白雪覆蓋。 2.指該物質(zhì)特定部分時(shí)可加定冠詞: The air(in the room)is bad. (屋里)空氣不好。 The water isn't very clean. 這水不太干凈。 Don't stand in the rain. 別站在雨里。 Wipe off the dust. 把灰塵擦掉。 3.有時(shí)物質(zhì)名詞前還可加不定冠詞,表示: 1)“一種”: Marble is a precious stone. 大理石是一種珍貴的石料。 It was a special tea which tasted of chrysanthemum. 這足一種菊花茶。 2)“一場(chǎng)雨雪”: What a heavy rain. 多大的雨呀。 It was bitterly cold.a(chǎn)nd a heavy snow was falling. 天氣嚴(yán)寒,下著一場(chǎng)大雪。 3)“一份”: A chocolate ice-cream for me! 給我一棄巧克力冰淇淋。 An iced coffee for me. 給我一杯冰咖啡。 有時(shí)一個(gè)物質(zhì)名詞可表示可數(shù)的東西: I need two yards of cloth. 我需要兩碼布。(不可數(shù)) He wiped the books with a cloth. 他用一塊布擦?xí)?可數(shù))