高中英语课外辅导:谈 dare 和 need 的用法 |
http://www.sina.com.cn 2005/03/01 14:28 英语辅导报 |
dare和need既可作情态动词又可作实义动词用。在高一上学期这两个词出现较为频繁,而同学们经常混淆,现介绍一下这两个词的用法: 1. 作情态动词时,常用于否定句、疑问句或条件句中。 2. 在肯定句中,常用作实义动词,构成疑问和否定需借助do(does,did),need后面常接带to的不定式,而dare后偶尔可省略to。need表示“需要”,且其主语是后面动词的宾语时,其后的动词既可用动名词一般体主动态表示被动含义,也可用不定式一般时的被动语态。 3. 两词如作情态动词,则没有第三人称单数形式和过去式形式,构成疑问句时,将其移至句首,构成否定句时,直接在其后加not。 1) You needn't come to the meeting this aftenoon if you have something important to do. 2) You don't need to go there if you have no time. 3) Having broken a vase,the boy stood still without daring raise his head. 4) The library needs cleaning (to be cleaned),but it'll have to wait until Sunday. 5) 1 wondered how he dared say that to the teacher. (文/冯欣; 英语辅导报新课标高一版 04~05学年度第25期;版权归英语辅导报社所有,独家网络合作伙伴新浪教育,未经许可,不得以任何形式进行转载。) |