虚拟语气在各种结构中的运用是历年三级统考必考的内容，考生必须熟练掌握。以下是由小编整理关于虚拟语态的用法的内容，希望大家喜欢!
虚拟语态的用法
一、虚拟条件句中虚拟语气的运用：
虚拟条件句从时间上又分为与现在事实相反，与过去事实相反，与将来事实可能相反三种情况。表示与现在事实相反的，if从句用过去式，主句用would 或could ,should ,might加原形动词。与过去事实相反的，if从句用过去完成时，主句用would或could ,should ,might+have done结构。与将来事实可能相反的，if 从句用should或were to 加动词原形，主句用would加动词原形。
1、If a better material _____, the strength of the part would have been increased.
A. had been used
B. had been using
C. being used
D. using
根据前面的讲解，正确答案为A。
2、Had the weather been good, the children _____ out for a walk.
A. had gone
B. could have gone
C. would go
D. went
答案：B。与过去的事实相反。当if从句中含有were, had, should这三个词时，if可以省略，主谓倒装。
二、某些动词后的宾语从句以及某些名词后的表语或同位语从句中虚拟语气的运用，这些动词或名词包括：
suggest suggestion,proposeproposal,advise advicedemand, insist, order, request, require, recommend, desire, ask, decide等。在这些从句中，谓语形式为should加动词原形，should可以省略。
例：The general’s command was that the soldiers _____ their fort and carry out more important task.
A. would leave
B. leave
C. left
D. have left
答案：B
三、在It is desired 或desirable, It is important等结构后面的主语从句中，动词用原形或should+原形动词。这些结构有：
“It is suggested”, “It is requested”,“It was ordered”, “It is necessary”, “It is essential”, “It is vital”, “It is urgent”,“ It is impossible”, “It is preferable”, “It is advisable”, “It wasproposed”等。
例：It’s desired that she _____ to teach us at least twice a week.
A. comes
B. will com
C. come
D. may come
答案：C
