請看下面一道題：The man in prison insisted that he _________ nothing wrong and _________ set free.
A. had done, should be???????????????????????
B. should do, should be
C. had done, had been????????????????????????
D. should do, had beend do, had be

【分析】此題容易誤選B，想當然地認為 insist 后的從句謂語要用“should+動詞原形”這樣的虛擬語氣。事實上，insist后的從句謂語是否用“should+動詞原形”這樣的虛擬語氣，要看該謂語動詞所表示的含義。一般說來，若該謂語動詞所表示的動作尚未發(fā)生，或尚未成為事實，則用虛擬語氣；若該謂語動詞所表示的動作已經(jīng)發(fā)生，或已經(jīng)成為事實，則要用陳述語氣。對上題而言，坐牢的這個人堅持了兩點：一是沒做錯事，二是應(yīng)該釋放。很顯然，在坐牢這個人看來，“沒做錯事”應(yīng)該是事實，故用陳述語氣；“被釋放”還不是事實（因為他還在坐牢），故用虛擬語氣。所以此題的最佳答案應(yīng)為A。又如：He insisted that I had read his letter. 他堅持說我看過他的信。（“看信”已成為事實，故用陳述語氣）He insisted that I should read his letter. 他堅持要我看他的信。（“看信”尚未成為事實，故用虛擬語氣）
請再做下面一題：

The patient insisted that he _________ ill and _________ to the hospital.
A. wasn’t, wasn’t sent???????????????????????
B. wasn’t, shouldn’t be sent
C. shouldn’t be, wasn’t sent???????????????
D. shouldn’t be, shouldn’t be sent
答案選B，因為在說話者看來，“沒病”是事實，故用陳述語氣；“不送醫(yī)院”尚未成為現(xiàn)實，故用虛擬語氣。?

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