不定冠词的考点性用法 1. 用于序数词前:用在序数词前表示“再一”“又一”。如: She thanked him a second time. 她再次向他道谢。http://yingyu.chazidian.com Shall I ask her a third time? 我还要问她一次吗? 2. 用于由动词转化来的名词前:表示一次、一番等义(通常与 have, take, make, give 等动词连用)。如: We’ve already had a try at it. 我们已经试过一下。 I went down to the beach and took a swim. 我到海边去游了游泳。 3. 用于专有名词前:相当于a certain,意为“一个”“某个”。如: The house next door has been bought by a Mr Jones. 隔壁的 房子被一个叫琼斯的先生的人买下了。 4. 用于抽象名词前:使之具体化,表示与该之相关的具体的人或事。如: He was a success in business. 他事业成功。 It’s a pleasure to talk with you. 同你谈话是件令人愉快的事。