A a ［误］ I think it is an useful English dictionary. ［正］ I think it is a useful English dictionary. ［析］在不定冠词 a 与 an 的用法中要注意的一点是：an 用在以元音开头的词之前；而 a 则用在以辅音开头的词之前。要特别注意的是以 u 字母打头的单词，如 useful,university 等，其第一个音标是［j］，所以要特别予以注意。 ［误］ I need a hour to finish this letter. ［正］ I need an hour to finish this letter. ［析］要注意 hour 和 honest 的第一个字母不发音。 ［误］ My teacher is a unknown man, but he is a very good man. ［正］ My teacher is an unknown man, but he is a very good man.
