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一.句型  It is + adj. + for sb. (of sb.) to do sth. （对事加以评论 / 对人加以评论） 
不定式短语作主语时,常用形式主语it来代替,而真正的主语放在句子的谓语后面。例如： 
It is difficult for you to read through this book a week or so.   对你来说一星期左右看完这本书有困难。 
It is useful for you to learn how to use the computer.  学习使用计算机对你有好处。 

It was brave of you to go into the burning building to save the child.    你冲入火场救那个孩子，真勇敢。 

It‟s necessary for us to learn English today.  现在对我们来讲，学英语非常重要。 

二.（a）few 和（a）little 的用法 
1. (a) few 用在可数名词n..[C]之前，(a) little 用在不可数名词n.[U]之前。例如： 

He took a few biscuits.  (a few = several)  他拿了几块饼干。

He took few biscuits.  (few = not many)  他拿的饼干不多。 

He took a little butter. (a little = some)  他拿了点黄油。 

He took little butter. (little = not much)  他拿的黄油不多。 

2. few 可由hardly any 或almost no 所替代，含否定的意味。例如： 

The composition is well written; it has few mistakes. = The composition is well written; it has hardly 
any mistakes. 这篇作文很好写，几乎没有多少错误。 
Few men can solve it. = Almost no men can solve it.  几乎没有人能解决它。 

3. a few相当于some, several, 含肯定的意味。例如： 
He has a few friends. = He has some friends. = He has several friends.  他有一些朋友。 
4. a little 和little之间的差别，就和a few 和few的差别一样，只是(a) little 修饰不可数名词,表量
或程度。例如： 
He grows worse; there is little hope of his recovery.  他病情恶化了，恢复的希望很小了。     

He is not much better, but there is a little hope. 他病情不是那么好，但是有点希望。 

三.其它的数量形容词 
1. plenty of, a lot of, lots of 都表示许多，修饰复数可数名词或不可数名词。例如： 
    The room contained plenty of / a lot of / lots of students.  这个房间容纳了许多学生。（students
是复数名词） 
    The room contained plenty of / a lot of / lots of furniture. 这个房间容纳了许多家具。(furniture 是
不可数名词) 
2. a great deal of, a good deal of, a large quantity of, a small quantity of, a large amount of, a small amount of 均表量，修饰不可数名词。例如： 
The room contained a large quantity of furniture. (不可数名词) 

The room contained a large amount of furniture. (不可数名词) 

The room contained a small quantity of furniture. (不可数名词) 

The room contained a small amount of furniture. (不可数名词) 
3. a number of “许多；一些”；a great number of, a large number of, a good number of “许多”，修饰复数可数名词，并且要与复数动词连用。例如： 
A number of books are missing from the library.  图书馆的许多书丢失了。 

The number of books from the library is large.  图书馆的图书数量很大。 [the number of  + 复数名词 + 单数(be)动词] 
The room contained a great / large / good / number of students. （复数可数名词）   这个房间容纳了许多学生。
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