時間定語從句虛擬語氣
一、虛擬語氣用于定語從句中
在It is (high, about)time(that)…句型中,that引導(dǎo)的定語從句中的謂語常用一般過去時來構(gòu)成虛擬語氣。
例:It’s about time that we put an end to this controversy. 現(xiàn)在該是我們停止這場爭論的時候了。 例:It is time we went to bed.
我們該去睡覺了。
二、虛擬語氣用于if only 引導(dǎo)的從句中
在if only引導(dǎo)的從句中,謂語動詞須采用虛擬語氣,其用法與wish后賓語從句的用法基本相同,表示“但愿”,“要是…就好了”的意思。 例:If only I knew what you wanted. 要是我知道你需要什么就好了。
例:If only he had arrived in time,he would not have been punished.
他要是準時到達就好了。經(jīng)典練習(xí):
1、It’s already six o’clock now. Don’t you think it’s about time____? A)we are going home B)we go home C)we went home D)we can go home
2、If only the committee____the regulations and put them into effect as soon as possible. A)approve B)will approve C)can approve D)would approve
3、It’s necessary____the dictionary immediately. A)that he will return B)that he returned C)that he return D)that he has to return
4、She must have had an accident, or he____then.
A)would have been here B)had to be here C)should be here D)would be here
5、I apologize if I ____you, but I assure you it was unintentional. A)offended B)had offended C)should have offended D)might have offended
解析:
1、答案選C)。在it’s about time that…..句型中,定語從句的謂語動詞應(yīng)用過去時來表示虛擬語氣。所以C項是正確的。
2、答案選D)。if only表示一種愿望,謂語用“would+動詞原形”表示對將來事實的愿望,所以D是正確的。
3、答案選C)。在由it is necessary 等引導(dǎo)的主語從句要使用虛擬語氣,虛擬語氣的謂語動詞用“should+動詞原形”或動詞原形。
4、答案選A)。由or引出的是與事實相反的假設(shè)條件,因此空缺處應(yīng)填入表示虛擬語氣的.謂語動詞。前一個分句中表示的是過去的時間,所以后一分句要用would have done的形式。所以A是正確的。
5、答案選B)。本題中but分句中的it was 表明事情發(fā)生在過去,因此條件句應(yīng)用過去完成時,表示與過去事實相反,所以B是正確的。
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