大学英语三级语法知识总结汇总

三级语法考点归纳一．虚拟语气1、 if 句中虚拟形式if 引导得非真实条件句(纯粹假设或发生得可能性不大):条件 从句 主句与现在相反 did (be were) would/ should/ might/ could do与将来相反 did (be were) would/ should/ might/ could do与过去相反 had done would/ should/ might/ could have done例句If we left (leave) now, we should arrive in time、If they hadn’t gone on vacation, their house wouldn’t have been broken (break) into、2、 原形虚拟:a、 表命令、决定、要求、建议等词语之后得that分句中,用动词原形。suggest, demand, advise, propose, order, arrange, insist, mand, require, request, desire …… that ＋(should) do例如 He suggested that we should leave early、 My suggestion is that we should tell him、b、 It is (was) 形容词/名词 that …… (should) do/例如 It is absolutely essential that all the facts be examined first、3、 一些句型中得虚拟形式:1、 It’s (high, about, the first, etc、) time (that) …动词过去时… 例如 It’s time we left、 例如 It is time we went to bed、2 would rather/sooner 宁愿 as if/ though 好像would rather/sooner 谓语用过去时 与现在或者将来相反as if/ though 谓语用过去完成时 与过去相反4.练习1、 I _______ try it again if I_______you、A、 will; am B、 should; am C、 would; were D、 would; had been2、 If it _______ not for the water, the plants _______live、A、 were; would not B、 is; could not C、 were; could D、 did; could not3 、 If I _______ that chance to show my ability, I _______the president of this school、A、 have not had; could not bee B、 had not had; would not have bee C、 did not have; could not bee D、 doesn’t have; will not bee4、 He _______ by that burglar if you _______ to save him、A、 might have been killed; hadn’t e B、 will be killed; didn’t eC、 may be killed; did’t e D、 could be kill...