(2)当从句的主语是 it,谓语动词中又含有系动词be 时,可以把it和系动词be一起省略。此时构成连词(if,unless,when,whenever)+形容词的结构。如:Unless (it is) necessary,youd better not refer to the dictionary.如果没有必要,你最好不要查字典。
2.定语从句中的省略
(1) 一般说来,在限制性定语从句中,作宾语的关系代词 that,which,whom 可以省略;如:(2002上海春季)Is this reason (that) he explained at the meeting for his carelessness in his work?这就是他在会上解释他工作中粗心的原因吗? 而在非限制性定语从句中作宾语的关系代词 which,whom 不可以省略。试比较:Tom (whom) you saw yesterday fell ill.( whom可以省) 你昨天见到的汤姆病倒了。Tom,whom you saw yesterday,fell ill. ( whom不可以省) 汤姆病倒了,你昨天见到他了。
(2)在口语和非正式用语中,关系副词when,where,和 why 经常用that 来代替,甚至还可省略。如:
①This is the first time (when/that)he had trouble with the boss.这是他第一次麻烦老板。
② He wants to find a good place (where/that) we can have a picnic during the golden week holiday .他想找一个能在黄金周期间野餐的好地方。
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