( 常用的vi.有happen, seem, appear ,looks, 等.)
eg. It seems that he will be back in a few days.
It happened that he met his teacher in the street.
IV. “It”用作“形式 宾语”
Xi’an is a beautiful city, isn’t it? Is this your dog？No, it isn’t. 2. 指代性别不明的人（常指baby）/ 说话人不清 楚性别的人（常在打电话、敲门等时）: eg. The baby cried because it was hungry. There is a knock at the door. It must be Jack.
7. it + be + v.-ed+ that从句.
“据… / 有人（人们）…” It is reported that many people died in the
earthquake.
It is suggested that the students (should) build up their strength.
It's a waste of time playing computer games. It’s worth visting.
第三类：It is... that从句.(有4种) 5. It + be + adj. + that从句.
It is very clear that he’s round and tall like a tree.
(指环境)
It is half an hour’s walk to the city centre. (指距离)
How is it going? (指情形)
III.“It”用作“形式主语” （共8种情况，分三类）
第一类：It is ...to do. (有3种)。 第二类：It is... doing. (有1种) 第三类：It is... that从句.(有4种)
It was nearly midnight when she came back（. 指时间） IItt'issM15a0yy1u, a2n0.07.（指（价指格日）期）
It is summer now. (指季节)
It is about 5 kilograms.
（指度量）
It was very quiet in the café.
第一类：It is ...to do. (有3种)。 1. it + be + adj. (+ for sb.）+ to do sth.
“（对 sb.来说，）做某事是…的。”
It is important for us to learn English well.
adj.：legal，illegal，polite，impolite，possible, impossible , clear，obvious， evident , certain，suitable，fit，useful，useless， etc.)
It is certain that everything will get on well due to our hard work.
It is strange that he shouldn’t feel ashamed of his behavior.
（当adj.为strange/surprising /natural/ important/necessary等时，that 从句中即 (should ) + do）.
3. 代替上文中的指示代词this/that。 --Who is that over there? --It’s Helen.
II. “It”用作“非人 称代词”
Ⅱ.用作非人称代词
“it”表示天气、时间、日期、距离、价值、度量、温度、
环境，季节，情况等（称为非人称的it）：
It is a bit windy. （指天气）
more prosperous economy. (浙江)
A. As B. That C. This D. It
3. The doctor advised Vera strongly that she should take a holiday, but ______ didn’t help. (全国卷III) A. it B. she C. which D. he 4. I’d appreciate ______ if you would like to teach me how to use the computer. (山东) A. that B. it C. this D. you
第二类：It is... doing. (有1种) 4. it + be + n./ adj. + doing sth.
It’s no use/useless doing sth 做某事是无用的
It’s no good/ a waste of time/fun/worth doing sth
eg . It's no use crying over spilt milk. It's useless thinking too much.
I. 单项选择
1. He didn’t make ____ clear when and
where the meeting would be held.
(天津)
A. this B. that C. it
D. these
2. ____ is our belief that improvements
in health care will lead to a stronger,
其中，当v.为insist; command,order; suggest, recommend; require, request, demand(一 坚持，二命令，三建议，四要求)等时，that 从 句中的v.用虚拟语气，即( should ) + do。
8. it + vi.+ that从句.
The use of “it”
it 真实身份大揭底
• Ⅰ.用作人称代词 • Ⅱ.用作非人称代词 • Ⅲ .It 作形式主语 • Ⅳ. It 作形式宾语 • Ⅴ. It 用在特定句型中 • Ⅵ. It 用在固定习语中
I “It”用作“人称 代词”
Ⅰ.用作人称代词
1. It 指代上文中提到的物、事。（简化语言，避免重复） eg. My pen is missing. I can’t find it.
I would appreciate it if I were admitted to the school football team. I hate it that you speak when your mouth full.
Don’t take it for granted that famous brands mean high quality.
（共2种情况）
Ⅳ. It 作“形式宾语”（共2种情况）. 1. “某些v. + it (宾语) + （n.\adj.）宾补 +
to do \doing\that从句(真宾)”
常用的v.有: think, believe, make, find, consider, feel, etc.
I think it no use arguing with him. I found it very interesting to study English. He made it clear that smoking is banned in the school. He considers it his duty to help those at risk.
V. 用在特定句型中
Ⅵ. It 用在特定习语中
it 充当形式主语，构成大量的常用句式。要注 意it后谓语不同的形式，并译成通顺的汉语。
1. It is a fact that... 事实是…… It is a wonder that... 这真是个奇迹 It is no wonder that... 难怪……
论……
Ⅵ. It 用在固定习语 中
Ⅵ. It 用在固定习语中
• 5. It doesn't matter... ……是无关紧要的 • It doesn't need to be bothered that... 无须担忧
…… • It makes no difference... ……毫无区别
Exercises Time
2. 某些谓v.+ it 形宾+ 真宾（that/when/if 从句） （常用v. 用：like, love, appreciate; dislike, hate ,depend on , count on; see to , make sure; take…for granted等。） eg.I don’t like it when one speaks with his mouthful. You can depend on it that he will come here on time.
6. it + be + n. + that从句.
It is no wonder that you are breathless.
It is a pity /shame that he should get into the habit of abusing alcohol.