3.would rather sb.+过去时,指现在或将来。
例:I’d rather Father were here now.
I’d rather they came here tomorrow.
2.在It is time/high time that sb.should do sth.
或It is time that sb.did sth
1.在主语从句中谓语动词的虚拟语气结构为:“should+动词原形”表示惊奇,不相信,惋惜等。
例:It is advisable/important/natural/necessary that sb.(should)do
3.When a pencil is put in a glass of water,it looks as if it________.
A.breaks B.has broken C.were broken D.had been broken
命题意图:此题考查虚拟语气用于以as if(as though)引导的表语从句或状语从句。此题属四星级题目。
知识依托:如果从句与现在事实相反,谓语动词用一般过去时;表示与过去事实相反,谓语动词用“had+过去分词”;表示与将来事实相反,谓语动词用“would (might,could)+动词原形。”
Li Ming speaks English as if he were an Englishman.(与现在事实相反)
It looks as if it might rain.(与将来事实相反)
It seems as if Tom had travelled a lot in China before.(与过去事实相反)
错解分析:本句意思是:当把铅笔放在一杯水里的时候,它看起来就跟断了似的。(其实没断)与现在事实相反。故选C项。
解题方法与技巧:看when a pencil is put in…中谓语时态。
答案:C
●锦囊妙计
做好虚拟语气,除了掌握基本的结构外,还要注意句子所表达的意义与现在过去,还是将来事实相反,看清时间状语,另外还要注意在其他结构中虚拟语气的运用。
2.I suggested that the meeting________ till tomorrow morning.
A.should put off B.be put off C.is put off D.will put off
命题意图:此题旨在考查suggest (建议)后加宾语从句,从句谓语动词的用法。此题属四星级题。
知识依托:suggest/arrange/demand/insist/order/require等动词后的宾语从句中谓语用(should)+动词原形。另外像advise/idea/order/demand/suggestion等词的表语从句和同位语从句,谓语动词也用(should)+动词原形。
错解分析:A项应用should be put off(会议被延期)。
C、D项都不符合虚拟语气结构。
答案:B
1.I wish I ________ you yesterday.
A.seen B.did see C.had seen D.were to see
命题意图:此题旨在考查wish后加宾语从句表示可实现的愿望。此题属四星级题。
知识依托:wish+宾语从句表示不可实现的愿望,译为“……就好了,但愿……”
错解分析:A、B、D项都不是跟过去事实相反的虚拟语气结构。
解题方法与技巧:掌握wish后宾语从句的三种谓语动词结构。
答案:C
3.(★★★★)How I wish every family________ a large house with a beautiful garden. (2002上海春季)
A.has B.had
C.will have D.had had
●案例探究
2.(★★★★)You didn’t let me drive.If we________ in turn,you________ so tired.
A.drove;didn’t get B.drove;wouldn’t get
C.were driving;wouldn’t get D.had driven;wouldn’t have got
1.(★★★★)Jane’s face suggested that she________ ill,and her parents suggested that she________ a medical examination.
A.be;should have B.was;have
C.should be;had D.was;has
34/如图14所示,电源电压为9V,标有“6 V 6 W”字样的灯泡正常发光。求
(1)灯泡的电阻;
(2)电阻兄的阻值大小。
35.湘桂铁路扩能改造工程于2008年12月11日启动,设计列车速度达200 km/h。
(1)若工程竣工后,列车按设计标准运行,从柳州到南宁约需1.1 h,则柳州至南宁的铁路线长约为多少?
(2)假设质量为4000 t的列车在平直轨道上匀速运行时,受到的阻力为列车重的,所有车轮跟铁轨接触的总面积约为0.8 m2。列车对铁轨的压强为多大?从柳州到南宁,机车共做了多少功?(取g=10 N/kg)
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