The bottle is very beautiful,but it is___.
A.no use B.of useless C.of no use D.useful
答:选C
be of + n=be +adj
This book is of great value.=This book is valuable.
be of 结构用法很灵敏,在句中可作表语、后置定语或宾补。
一、“be of+表示年龄( age )、大小( size )、颜( color )、重量( weight )、高度( height )、价格( price )、意见( opinion )、形状( shape )、种类( kind )和方法( way )等的名词”,表示“具有„„”,说明主语的特征。例如:
When I was of your age,I entered the war.
当我是你这个年龄的时候,我就去打仗了。
These flowers are of different colors.
这些花的颜都例外。
注意:在此结构中,如果后面的名词前有不定冠词 a /an ,则这个冠词相当于the same .例如:
The two boys are of an / the same age.
这两个男孩同龄。
二、“be of +物质名词”,表示主语是由某种材料制成或由某种成分构成,相当于 be made of,be built of,be made up of 等。例如:
The necklace is (made)of glass.
这条项链是由玻璃制成的。
Our class is (made up)of over 50 students.
我们班有50多个学生。
三、 be of 还可以表示所属关系,相当于belong to .例如:
China and India are of the third world.
weight的用法搭配中国与印度同属于第三世界。
Workers and peasants are of one family.
工人和农民是一家。
四、“be of +形容词最高级”,相当于 be one of„.例如:
His temper is of the quickest.
他的脾气是最焦急的。
Mr Liu is of the best teachers in our school.
刘老师是我们学校最佳的老师之一。
五、“be of+抽象名词( value, importance, use, help, interest 等)”相当于“be +该抽象名词相对应的形容词”。其中 of 表示“具备;具有”, of 不可以省略。例如:
They are of great help / very helpful to learners of English.他们对英语学习者来说是很有帮助的。
The press conference seems of great importance / very important.这个新闻发布会看来很严重。
这个题就属于第五种用法,is of no use=is useless,所以选C Freedom fighters can be found everywhere, and they are of all times.(Unit 14)
解放战士在各个地区,各个时期都存在。
该句的后半句,采用了be of接名词来说明句子的主语所具有的性质或特征。这是一种很常用的句式。
be of 后可接两种例外性质和类型的名词,他们的意义大相径庭。
1. be of后可接value,  importance,  use,  help,  significance,interest, benefit 等一些抽象名词,这样的结构用来说明句子主语所具有的作用、严重性或意义。在这类抽象名词前我们可用一些形容词,如: great,little, some, any, no, not much等来修饰抽象名词,用以说明程度。如:They are of great help to learners of English.
他们对英语学习者有很大帮助。
The book will be of great value to students of history.
这本书对学历史的学生将很有用。
The meeting is of great importance.
这个会议很严重。
This medicine is of no use.
这种药失效。
This matter is of no significance.
这件事无关紧要。在“be of + 抽象名词”结构中,其意义就相当于“be + 与该抽象名词同词根的形容词”。如:be of value→be valuable,be of help→be helpful,  be of use→be useful,be of importance→be important,    be of significance→be significant等。它们之间可以相互转换,因此,以上各例句可转换为:
They are very helpful to learners of English.
This book is very valuable to students of history.
This meeting is very important.
This medicine is useless.
This matter is insignificant.
2. be of +名词,还可用来说明句子主语在度量,大小,颜,类别等方面的特征。这类名词有 colour, age, size, height, weight, shape, type, kind等。在这类名词前常用different, all, the same,this, that,  a(n) +形容词等词来修饰或说明。如:
Coins may be of different sizes, weights, shapes, and of different metals.
货币可能在大小、重量、形状和铸造的金属方面都有所例外。
These pens are of many different colours.
这些笔有许多例外的颜。
The two rooms are of a size / of the same size.
这两个房间大小一样。
He is of the same weight as his brother.
他和他弟弟一样重。
The productive forces were of a very low level.
生产力处于非常低的水平。City Lights and Modern Times were of this kind.
“城市之光”和“摩登时代”就是这种影片。
注意:此类句型中的某些表达可以转换成“be + different / the same + in+抽象名词” 的形式。如:
Coins may be different in size, weight, shape, and metal.
These pens are different in colour.
The two rooms are the same in size.
of介词短语在句中作表语,of的含义有六种,分述如下:
一、“be of+抽象名词”,这时的of短语相当于这个名词的同根形容词,作为表语表示主语的性质或特征。of的意思是“具有、具备”等,常用于该结构的名词多见的有
of use=useful;of nouse=useless;of importance=important等。如:The matter is of great importance.=The matter is very important.在形容词前常用very来修饰,在“of+抽象名词”结构中,名词前常用great,much等来修饰。再如It is o fgreat importance for college students to master a foreign language.
=对大学生来说,掌握一门外语是很严重的。
二、“be of+集合名词或其它类型的名词”,相当于belong to或have。of表示归属关系或“有”的意思。如:The army and the people are of one family.=The army and the people belong to one family.军民是一家。
三、“be of+物质名词”表示主语是“用某种材料构成或制作的”,相当于be made of或be built of。如:Our building was of bricks.=Our building was built of bricks.
我们的楼房是砖建的。
四、be of+(表示种类、颜、年龄、形状、价格等)名词,多用来表示主语的特征。这类结构的主语可以是人,也可以是物,其中的of可以省略。常用于该结构的名词有:kind,age,colour,size,height,shape,type,way,price等。如:Several of the stamps were of the unusual kind.其中几张邮票是例外种类的。
The two boys are of the same age.这两个男孩年龄相同。
She is of a different way of thinking.她的思维方式与众例外。
These two kinds of article are of the same price.这两种物品价格相同。
五、“be of+名词”也可以表示“来源、组成”。如:
He was of a poor peasant family.他出身贫农家庭。The committee is of seven people.该委员会由7人组成。
六、“be of+形容词的最高级”相当于。如:

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