虛擬語態(tài)的用法如何使用虛擬語態(tài)

　　虛擬語氣在各種結構中的運用是歷年三級統(tǒng)考必考的內(nèi)容，考生必須熟練掌握。以下是由學習啦小編整理關于虛擬語態(tài)的用法的內(nèi)容，希望大家喜歡!

　　虛擬語態(tài)的用法

　　一、虛擬條件句中虛擬語氣的運用：

　　虛擬條件句從時間上又分為與現(xiàn)在事實相反，與過去事實相反，與將來事實可能相反三種情況。表示與現(xiàn)在事實相反的，if從句用過去式，主句用would (或could ,should ,might)加原形動詞。與過去事實相反的，if從句用過去完成時，主句用would(或could ,should ,might)+have done結構。與將來事實可能相反的，if 從句用should (或were to )加動詞原形，主句用would加動詞原形。

　　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

　　(根據(jù)前面的講解，正確答案為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。與過去的事實相反。當if從句中含有were, had, should這三個詞時，if可以省略，主謂倒裝。)

　　二、某些動詞后的賓語從句以及某些名詞后的表語或同位語從句中虛擬語氣的運用，這些動詞或名詞包括：

　　suggest (suggestion),propose(proposal),advise (advice)demand, insist, order, request, require, recommend, desire, ask, decide等。在這些從句中，謂語形式為should加動詞原形，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等結構后面的主語從句中，動詞用原形或should+原形動詞。這些結構有：

　　“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 was proposed”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)