主动形式表达被动意义的用法复习知识点精析
1．“系动词feel，sound，taste，look，smell，appear，seem，turn，stay，become，get，grow，keep等＋形容词/名词”构成系表结构，常常以主动形式表示被动意义。
This kind of wool shirt feels soft.
这种羊毛衫摸起来很软。
2．当sell，read，cut，wash，write，open，wear，run，burn等不及物动词后带状语(well/easily等)修饰，用来表示主语内在的品质或性能时用主动形式表示被动含义。
Have you bought the book that sells well these days? I think it is suitable for us teenagers.
你买最近畅销的那本书了吗？我认为它非常适合我们青少年。
3．在need，want，require，deserve，bear等动词、worth等形容词的后面，动名词主动形式表示被动意义，其含义相当于动词不定式的被动形式。
The house needs repairing(＝to be repaired)．
这房子需要修葺。
4．在某些“主语(人/物)＋be＋形容词＋不定式”中，不定式的主动形式表示被动意义。这些形容词有nice，easy，fit，hard，difficult，important，impossible，pleasant，interesting等。
The problem is difficult to work out.

这道题很难计算出。

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5．be to rent/blame主动形式表被动意义。
Who is to blame for the mistake?
谁应为这个错误接受谴责？

题一： The commander ordered that his soldiers ________at the foot of the mountain.
A. should stop     B. must stop C. will stop        D. would stop
The teacher demanded that the exam ________ before eleven. 
A. must finish        B. would be finished     
C. be finished        D. must be finished 
题二： It was ordered that no smoking ________in the library 
A. was allowed           B. would be allowed 
C. be allowed             D. had been allowed
It was demanded that we ________before daybreak. 
A. setting off           B. set off   
C. must  set off       D. will set off
题三： Our teacher suggested that we _______ proper exercise and enough sleeping hour.
A. had               B. should have       
C. ought to have        D. will have
His accent suggests that he _______from Guangdong.
A. is               B. has been       
C. should be        D. was
答案
题一： A；C
详解：order后接的that从句应用虚拟语气，谓语动词要用should+动词原形，should可以省略。
详解：demand后接的that从句应用虚拟语气，谓语动词要用should+动词原形，should可以省略；主语the exam与谓语finish之间是被动关系，所以finish要用情态动词的被动语态。
题二： C；B
详解：It is/was ordered后接的that从句应用虚拟语气，谓语动词要用should+动词原形，should可以省略;主语no smoking与谓语allow之间是被动关系，所以allow应用情态动词的被动语态。
详解：It is/was demanded后接的that从句应用虚拟语气，谓语动词要用should+动词原形，should可以省略。
题三： B；A
详解：suggest当“建议”讲时，其后的that从句应用虚拟语气，谓语动词要用should+动词原形，should可以省略。
详解：suggest当“表明”讲时，其后的that从句应用陈述语气。这里从句的内容是不受时间限制的客观存在，所以谓语动词应用一般现在时。

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