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it用作形式主语的用法

一．看我火眼金睛（改错）

l  .This is easier to lose friends than to make friends.

2. That is important for modern young people to master at least two foreign languages 

this/that 换成形式主语 it。

二．Why to use it.

      英语中不定式、动名词、主语从句在作主语时主语往往显得很长，使整个句子看上去有点头重脚轻，这样就借助“it”来作形式上的主语，而把真正的主语移到句子后边去，使全句结构上前后平衡。 “it”并无实际意义。

   To fall from the trees in the fall is common for leaves .

〓 It′s common for leaves to fall from the trees in the fall.

三．How to use it.

1.句子逻辑主语是动词不定式
如: It is very kind of you to give me a hand in time.
   It is my pleasure to address the meeting.

2. 句子逻辑主语是that从句
如:It so happened that the tickets were sold out.
  It is extremely obvious that she has been lying about her identity.

3. 句子逻辑主语是动名词短语
如:It is no use reasoning with him.
   It is no good reading in dim light.

四．牛刀小试

In fact，________is a hard job for the police to keep order in an important football match.
A. this     B. that    C. there      D. it

五.句子的逻辑主语为不定式

1) 1.It is ＋形容词 of sb. to do sth.

2.It is ＋形容词 for sb. to do sth.

2) Of/for

下列形容词: kind, good, nice, clever, wrong, right ,foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish后常跟of sb. to do sth

下列形容词:necessary, hard， important, difficult, easy, possible，common后常跟for sb. to do sth

六．     It做形式主语练习

1.I don’t think ___ possible to master a foreign language without much memory work. 

      A. this   B. that  C. its   D. it 

2.It’s not easy __us ___a foreign language.

   A. for; learning   B. of; learning   

    C. of; to learn     D. for; to learn 

3. It’s very kind ___ you ______ me.. 

      A. for, helping   B. of ,help      

     C. for, to help     D. of, to help