英语专业四级语法汇总下.ppt

英语专业四级考试语法试题汇总(下) 常见结构 must have done肯定的推测 (否定式 can not/could not have done) could/may/might have done不太肯定的推测 Should/ought to have done本来应该…但没有发生(否定式表示本来不应该…但发生了) Needn’t have done vs. didn’t need to do must vs. have to ought to (更强调责任义务)vs. should(适宜) Dare May, might, can, could should FORMAL 表将来的可能: If anyone should ask for me, Ill be in the managers office. Should you (= If you) ever need anything, please dont hesitate to contact me. used after that and adj. / n. that show an opinion or feeling: Its odd that she should think I would want to see her again. used after ‘that’ ，(should be虚拟): We agree that the money should be paid tomorrow.4 FORMAL used after so that and in order that to show purpose: He took his umbrella so that he shouldnt get wet.5 FORMAL used after for fear that, in case and lest: He took his umbrella in case it should rain. 让步状语从句 though, although 后面的从句不能有but，但是 though 和yet可连用 as, though引导的倒装句 Try hard as he will, he ....　 = Though he tries hard, he … Child as /though he was, he ... 让步状语从句 ever if, even though.　即使　　Well make a trip even though the weather is bad. (no matter) whether…or if while no matter +疑问词 / 疑问词+后缀ever  no matter what = whateverno matter who = whoeverno matter when = wheneverno matter where = whereverno matter which = whicheverno matter how = however　 注意：no matter 不能引导主语从句和宾语从句。 Other Key points Since Since he came back, he has finished writing two novels. It is/has been three months since he came back from Beijing. Since he is not here, we will not go on with the work. (原因) Such … that 如此…以至于 So…that 表结果/目的 附: (不定式) * such as to 如此…以至于,达到…程度 * so as to表结果/目的 By the time By the time you get to the station, the train will have left. (一般现在含将来意味, + 将来完成) By the time I got to the station, the train had left. (一般过去, + 过去完成) each time/ every time Every time you need my help, I will be there. Every time he came to the city, he would call on me. as As time went by, he gra