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语法对点讲练三 冠词 一、不定冠词 知识点讲解 泛指某一类人、事、物，相当于any。 I know that the pressure to stay slim is a problem, especially for an actress. 泛指某人或某物，但不具体指明何人或何物，相当于a certain或some。 A John called you just now. 表示数量，有“一”的意思，相当于one。 A bird in the hand is worth two in the bush. 表示“每一”，相当于per。 The car is travelling at 100 miles an hour. 用于序数词前，表示“又一；再一”。 Please give me a second chance. 抽象名词具体化，表示一个具体情况，一个具体动作。 Their performance became a success. 在一些物质名词前加不定冠词，表示“一阵；一场；一份；一种”。 There will be a heavy storm. 用于有形容词修饰的一日三餐前。 He has a light breakfast every morning. 用于有形容词修饰的季节、日期前。 We had a very hot summer. We had a wonderful Sunday. 与形容词比较级连用，表示“一个更……的……”。 | 
