3.before和since的用法 (1)before常用于表示“还未……就;不到……就;……才;趁……;还没来得及”等含义。 We had sailed four days and four nights before we saw land. He rushed out of the house before I could say anything else. (2)句型It was/will be+时间段+before...意为“过了多久才……”。It was not long before... /It will not be long before...意为“不久就……”。 It will be one year and a half before I come back. It was not long before he sensed the danger of the position. (3)since从句的谓语动词一般是短暂性动词,主句谓语动词则是延续性动词或反复发生的动作。since引导的从句时态为一般过去时,主句时态为现在完成时或现在完成进行时。 She has been working for the company since she left school. (4)句型It is/has been+时间段+since...意为“自从……到现在多久了”。 It is a long time since I saw you last time. = I have not seen you for a long time. It has been two years since I was admitted to this key middle school. = I was admitted to this key middle school two years ago. It is three years since I smoked a cigar. = It is three years since I stopped smoking a cigar. 三、原因状语从句 1.because,as,since,now that的用法区别如下表: 引导词 位置 内涵 语气 能否回答why 能否强调 because 主句前 或后 直接原因 强 能 能 as 主句前 或后 已知原因 弱 不能 不能 since/ now that 主句前 —Why are you absent from the meeting? —Because I am ill. He is disappointed because he didn’t get the position. As his mother was a great music lover,he lived with music from birth. Since his music style was new,he decided his hairstyle had to be new too! 2.除了状语从句外,一些介词短语也可以表示原因。如:because of,thanks to,due to,owing to,on account of等。 They were late because of the traffic. 3.for引导表示原因的并列句,补充说明根据什么推断出前一分句的结果。 He must have gone to bed,for the light is out. 四、地点状语从句 注意地点状语从句与定语从句的区别,试比较: This is the place where we used to live a few years ago. Let’s go where we can find a better job. 五、目的状语从句与结果状语从句 1.so that引导的目的状语从句及结果状语从句的区别: (1)so that引导目的状语从句时,只能置于主句之后,从句谓语部分常需用情态动词can,may,could等,可用in order that代替。后者更正式,引导的状语从句可置于主句前或后。 (2)so that引导结果状语从句时,从句的谓语部分一般没有情态动词,其作用等于so。试比较: We got up early so that we could catch the train.(此句只强调早起的目的,结果未明) We got up early so that we caught the train.(此句表明了早起的结果:赶上了火车) 2.so...that与such...that引导结果状语从句的区别: 其规律由so与such的不同词性决定。such是形容词,修饰名词或名词词组,so是副词,只能修饰形容词或副词。常见以下几种句型结构: (1)so+形容词/副词+that从句。 He was so excited that he could not say a word. (2)such+a/an+形容词+单数可数名词+that从句。 It’s such a good chance that we must not miss it. (3)such+形容词+复数名词/不可数名词+that从句。 It was such fine weather that we went out for a walk.
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