Sentence patterns: 1. Sb + think + it + necessary + ( for sb. ) to do
代词：用于指人以外的一切生物，无生命的东西和事情 日期，距离，价值，度量，温度，环境等
➢ it 用作非人称代词，指代日期、时间、季节、天气、温 度、距离、重量、环境、情况等， 常不翻译出来
It’s quite hot here in summer, isn’t it ? (天气)
It’s early midnight now . We’d better go to bed. (时间)
weather,
the
way
—Everything is so nice.
指代性别不详的婴幼儿
他\她是谁？ Who is it?
The baby is crying. It might be hungry.
指代说话者心目中不太清
---Who is knocking
楚的那个人
at the door?
It’s about an hour’s drive from here to Nanchang. (距离)
It was noisy last night. （情况）
— Do you like it here？(2004年高考全国卷
Ⅱ)
—Oh, of life.
ye(环s.境T等h)e
air,
the
a house
3. 2. We’ve been looking at houses but haven’t found
___ we like yet.
4.A A. one B. ones C. it D. them
5. 3. I’m moving to the countryside because the air there
is much fresher than ___ in the city.
6. A. ones B. oneC C. that D. those
the air
Exercises:
1.---would you like to buy a bicycle of this kind? ---Yes, I'd like to have_________.
—“Who is it over there?”---It's may be Tom.
—“It must be headmaster.”
—“No, it can’t be him, for he has gone to
Paris.”
I.人称代词
a.用作人称代词，代替前文提到过的事物，以避免重复:
Throw wasted paper in the dustbin. It's just beside you. b.还可以指代前面整件事情： This spade is made of iron. It is known to all. 2.指示代词(在回答含有指示代词this\that的问句时 常用it指代)---Who is that?-- It is Lucy. What’s that on the right? I guess it might be a watermelon.
A. it B.that √C.one D.this
2.The color of my coat is different from__of yours.
A. it B. one C√. that D. this
3.The machines we use today are much better than _____we use ten years ago.
—“Hello! Who is that (speaking)?”
—“This is john/I (speaking).
此处不能用it代this
注 1: it, one, that 区别
➢ it 指代上文提到的表特指的单数可数名词或不可数名
词，即“同类又同物”;
➢ one表示“同类不同物”, 只能代替可数名词单数，相
当于a/an+可数名词单数；还可以指众多中的一个 （注意它在定语从句中的指代）(复数n用ones指代)
➢ that 表示“同类不同物”，（只在平级结构或比较级
结构或表对比结构中指代前文出现的表特指的可数名 词单数或不可数名词。（复数名词用those指代)
I had a good pen, but I lost it yesterday. I’ll buy one tomorrow.
易误辨析: it / one / that
the house that the Parkers bought
1. The Parkers bought a new house but ___ will need a
lot of work before they can move in.
2. A. theyB B. it C. one D. which
A. the one B. that C√. where D. which
2. Is this factory _______ her mother worked in last
year?
A√ . the one B. that C. where D. which
3. ______clean the blackboard is to be praised.
A. it B.that C.one √D.those
ese shoes are too tight, do you have large___?
A. it B.that √C.ones D.one
定语从句
1. Is this the factory _______ her mother
worked last year?
A√ . Anyone who B. The boy C. The one D. the
ones
形式宾语
The chairman thought ___ necessary to invite Professor Smith to speak at the meeting.(05全国)
A. that BB. it C. this D. him