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1、对....没用it is useless for our healthybe of 的用法一、“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常见的有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 of great importance for college students to master a foreign language.=It is very important...对大学生来说,掌握一门外语是很重要的.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、颜色、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.其中几张邮票是不同种类的.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.她的思维方式与众不同.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one of.如：***.Wang is of the best teachers in our school.=Mr Wang is one of the best teachers in our school.王老师是我们学校里最好的老师之一. useless和useful的用法useless 和 useful是两个意思相反的单词uselessa.1. 无用的;无价值的The blunt knife is useless.这把钝刀毫无用处。

2、2. 无效的;无益的I realized it was useless to reason with him.我知道和他说理是毫无意义的。

3、3. 【口】(人)无能的,没有用的I was useless at maths.当时我的数学差极了。

4、usefula.1. 有用的;有益的;有帮助的[(+to/for/in)]She gave us some useful information.她给了我们一些很有用的信息。

5、2. 【俚】值得高度赞扬的;对...很熟练的[(+at)]。

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