薛城信息社
2023-05-30
450
10
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不定冠词的8大用法和例句归纳与详解 不定冠词有a和an两种形式。a用在以辅音音标开头的词前,an用在以元音音标开头的词前。如：a house，a useful book，an hour，an umbrella 不定冠词的用法主要有: 1) 泛指某人或某物,不具体说明其为何人或何物。在行文叙述时,第一次提到某个人或事物时,通常使用不定冠词,此为“泛指”。如: A girl is asking for you on the phone. My mother works in a hospital. 2) 用在单数可数名词前,表示一类人或事物,即以一个个体代表整类人或事物,此为“类指”。如: A plane is faster than a train.飞机比火车快。 A snake is a cold-blooded animal.蛇是冷血动物。 3) 表示“一”,但数量概念没有one强烈。如: They waited there for an hour.他们在那等了一个小时。 Rome wasn't built in a day.罗马非一天能建成。(即:冰冻三尺非一日之寒。) 如特别强调数量,应使用one。如: I have only one dictionary and I need it myself. 4) 用在表示时间、速度、价格等计量单位的名词前表示“每一”,相当于per或every。如:The plane can get 300 kilometers an hour.飞机的速度是每小时300公里。 The doctor told her to take the medicine three times a day.医生叫她一天服三次药。 5) 用于抽象名词、物质名词前(特别是这两种名词有定语修饰时),使之意义具体化,表示“一种”、“一件”、“一份”等。如: It is an honour for me to be invited to the party. 我被邀请参加聚会是一种荣誉。(honour是抽象名词,an honour指一件荣誉的事) There was heavy rain last week.(rain为物质名词,这里指一场雨) 6) 用于序数词(后加名词)前,表示又一个,又一次。如: He tried a sixth time and succeeded.他又试第六次,结果成功了。 When I sat down,a fourth student rose to speak.当我坐下时,又有第四个同学起立发言。 7) 用于某一个人名、地名前,使专有名词普通化。如: A Mr.Li has been waiting for you.一位姓李的先生一直在等你。 Chongqing is known as a Shanghai of the west.重庆被称作西部的上海。 (Shanghai是专有名词,本句中a Shanghai指和上海一样繁华的城市) 8) 用于某些固定词组中,是这些词组不可缺少的组成部分。如: in a moment立刻,马上once upon a time从前 as a result (of)作为(……)的结果 in a hurry急忙地 in a word一句话,总而言之once in a while偶尔地 have a good time过得很愉快have a word with与……说句话 have/take a look (at)看一看 have/take a rest休息一下 take an active part in积极参加 (比较:take part in参加,不能说take a part in) do sb.a favour帮某人的忙 put an end to结束 at a mouthful一大口地all of a sudden突然地 as引导的非限制性定语从句 在as引导的非限制性定语从句中，连接代词as在句子中可以作主语、宾语或表语等，可以指人或物。其在定语从句中的位置比较灵活，即可以在句子前面，在句子中间或句子末尾。常用的结构有：as we all know; as is well known to…; as is often the case; as is said/mentioned above; as has been said before; as I told you before; as is evident; as often happens; as can be seen; as is/was expected; as we expect; as I can remember等。 [注意1]as通常只指整个句子的内容，不表示部分内容。 [注意2]as引导的非限制性定语从句通常指"事先可以预料到的""料想到的"，表达"好"的方面。 [注意3]as引导限制性定语从句时，常构成the same…as…; such…as…; so/as …as…等结构。在从句中既可以指人、物，也可以指整个句子。 [例句] This is also part of your work, as I told you before. 我曾告诉过你，这也是你工作的一部分。 The man was a teacher, as was evident from his way of speaking. 从那人说话的样子可明显看出，他是个老师。 Such ideas as he hits on are worthless. 像他那样偶然想起的主意是无用的。 It's the same story as I heard from her yesterday. 这故事跟我从她那儿听到的相同。 which引导的非限制性定语从句(也引导限制性定语从句) which引导的非限制性定语从句既可以指整个句子内容，也可以指句子的部分内容(如单词或词组等)，在句子中可以作主语、宾语(动词或介词的)、定语等。注意它在句子中的位置：只能放在主句后，不能放在主句前。表达的内容是"不好的"、"事先没有预料到的"等时，常用which，只指物。 [例句] The clock, which my grandfather bought, is still in good order. 这时钟是我祖父买的，现在还走时很准。 The picture, for which he paid an enormous amount of money, was a forgery. 那幅画他花了一大笔钱购买，却是幅赝品。 The weather turned out to be very good, which was more than we could expect. 天气结果转晴，这是我们没有预料到的。 
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