在句3与句4中，it的作用是_形__式__主__语__, 真正主语 是_动__名__词__短__语___.
__i_t __用来指代前面提到的可数名词，所指的是事物本身； __o_n_e__则用来替代前面出现过的可数名词，泛指，指一类
事物中的一个 .
_th__a_t__用来代替不可数名词或单数可数名词，特指。
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一.It 作为形式主语
ห้องสมุดไป่ตู้
二.
当不定式、动名词、从句等用作句
子主语时，为保持句子平衡，通常把真正的
某人做某事某人是…….
2 It’s foolish of you to quit your job now.
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3.It is no good crying over spilt milk. 4.It is no use casting pearls before swine .
十年树木，百年树人。
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Grammar: Use of “It”
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课文原句再现
1.It’s a beautiful day here and I am sitting under the big tree at the end of the garden.
2.Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.
④ It never rains but it pours(泼水).
不鸣则已, 一鸣惊人。
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⑤ It is easy to open a shop but hard to keep it always open.
创业容易守业难。
⑥ It takes three generations (代,辈) to make a gentleman.
• It is about 8:30 now. time
distance
• It is about 25km from Longxian to Bazi.
• It lies in the south of Shaoguan city. place
• It is 40°C ! You got a high feveTre! mperature
3.Believe me, I know how easy it is to begin smoking and how tough it is to stop.
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The use of “it” 1.用作人称代词，代表前面提到的人或事物。 1) Who’s it? ___I_t’_s____me. 2) Look at the picture. __It___is a picture of our
A. That, It B. It, He C. He, It D. Who, He
一般说来，在指代身份或性别明确的人时，通 常要根据情况用代词he／she；若是指代身份 或性别不明的人，则用代词it
Ba8ck
1. I can’t find my pen. I’m going to buy _o_n__e_. 2. Life today is better than __th_a_t__ in the old days. 3. I can’t find my pen. I must have lost __i_t __.
主语放在句末，而在句首使用形式主语it.
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eg: 1. It is illegal（for a teenager）to drive a car without a license.
2. It is necessary for you to give him a letter.
3. Conclusion：
dangerous…
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（2）It +be+ adj+ of sb. to do sth
此处adj. 通常为描述人的形容词：kind， unkind，nice，rude，cruel，considerate， careless，foolish，stupid，wise，crazy. eg: 1. It‘s kind of you to help me with the problem.
Good morning, everyone!
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Proverbs(谚语) with “It”
① It is never too old to learn.
活到老, 学到老。
② It is easier to fall than to rise. 摔倒容易爬起来难。
③ It is no use crying over spilt (溢出的) milk. 覆水难收。
Conclusion :it 可以用作非人称代词，表示 _天__气__,_时_间___,__距__离__,_地__点___,_温__度___,_日__期__ 等。
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e.g: ___C___ a. Jim is at the door．____wants to see you． b. Someone is at the door．____must be Jim．
形式主语
不定式短语
4. 在句1和句2中 it 的作用是___________ ,真正主语是________。
（1）It +be +adj.+（for sb.）to do sth. 此处adj. 通常为描述事件的形容词：easy，difficult hard，necessary，impossible，likely，right， wrong，important，obvious，useful，useless，
school. 2.用于代替指示代词this 和that。 ---Is this jacket yours? ---Yes, __it____is.
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Read and analyze the following sentences.
• It is Friday today. Date
• It was very cold last Monday. weather