9B Unit1 Asia 知识点讲解
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| 名称 | 9B Unit1 Asia 知识点讲解 |  | |
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| 科目 | 英语 | ||
| 更新时间 | 2014-12-19 07:25:58 | ||
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9B Unit 1 Asia知识点讲解
Comic strip &Welcome to the unit（P6-7）
1．It’s tiring to climb the steps and my feet hurt.
tiring adj. （事、物）令人疲劳的，使人厌倦的。
tired adj. (人 )感到疲劳
be ________ of 对……感到厌烦
It’s _________ for me to walk for 30 minutes. 走30分钟的路对于我来说很累人。
It was a ________day and she felt very _______. 那是疲劳的一天，她感到很累。
类似的形容词有：amazing/amaz ( http: / / www.21cnjy.com )ed exciting/excited boring/bored interesting/interested
step n. 台阶,步骤 You can go down the steps from here.
Bei ( http: / / www.21cnjy.com )ng honest is the first ______if you want to make friends with others.
v. 踩 I’m sorry to _____ on your foot.
hurt (hurt, hurt, hurting, hurts)
vt. 使受伤，损害 She hurt herself when she fell down. 她跌倒时伤了自己。
She hurt my feelings. 她伤害了我的感情。
Unluckily, he was badly hurt in the accident.
vi. 感到疼 My leg hurts.
n. 痛苦 The experience left me with a feeling of deep hurt.
这段经历给我心灵留下了严重的创伤。
2．There’s still a long way to go. ( to go 是动词不定式做定语。)
eg：a wonderful place ( http: / / www.21cnjy.com )to meet friends find someone to talk with
look for a room to live in
1) He is alw ( http: / / www.21cnjy.com )ays the first person ___________ (come) and the last one _______ (leave ).
2) There are many ( http: / / www.21cnjy.com ) interesting books _________ ( choose ) from, but I don’t know which to
borrow.
3) There is nothing ______________ (worry )about.
3． go on to do 一事做完，接着做另一件事
go on doing 事情暂停后继续做；一直做某事
go on with 后接名词或代词
1）After a short b ( http: / / www.21cnjy.com )reak ,he went on _________(read) the rest of the text.
2）After reading the novel , he went on _________(write) an article.
4. wake v. (woke, waken,waking,wakes) adj. awake
wake up your sister
wake (me/him/her/them/you…) up
Reading（P8-11）
1．used to do sth. 过去常做某事，现在不了
be used to (doing) sth. 习惯于某事或习惯于做某事。
get/become used to (doing) sth.
变得习惯于某事或习惯于做某事，往往含有“克服困难去适应”之意。
be used to do sth.
被用来做某事
be used for doing sth.
Wood is used for ( http: / / www.21cnjy.com )_________(make) paper.= Wood is used ________(make) paper.
木材被用来造纸。
My grandfather _________ living in the village. 我爷爷习惯住在乡下。
The food here is not so tasty but you will _____________that.
这里的伙食不怎么样,但你会习惯的。
2．( v.) turn…into…把……变成…… turn around转过来
turn to 转向；翻到(书的某一页)；向某人求救
turn left/right 左转/右转 turn red 变红 turn out结果是
turn up调高 turn down调低 turn on 打开 turn off关掉 turn back 这回
(n.) wait for your tur ( http: / / www.21cnjy.com )n 等轮到你 take turns/take it in turns 按顺序轮流
It’s one’s turn to do sth. 该轮到某人做某事了。
1)As a famous ( http: / / www.21cnjy.com ) cook, he can ______ these things ____ some delicious dishes quickly.
2)He ______________ his head as he heard someone calling him.
他转过头因为他听到有人在叫他。
3．It is worth a visit 它非常值得一游。
be worth sth be( well )worth doing
The music is well worth ______________.这音乐很值得一听。
The clock is hardly worth ___________(repair).Why not throw it away
4．watch the raising of the national flag 观看升国旗
raise （vt.）( raised raised raising raises) 举起，提高，升起，募集
rise (vi.) ( rose risen rising rises ) 上升，
The teacher said the sun __________in the east.
He _________his hands and asked a question.
He says the best way to __________ money is to sell newspapers.
The price of the house________________recently.
5．run (ran run running runs)
The road runs along the river bank.这条路沿着河岸延伸。
run after ( http: / / www.21cnjy.com ) 追赶 run away 逃走 run upstairs上楼 run to sb.向某人跑去
6．wonder ( n.) one of the___________ 奇迹之一
( v.) I wonder what really happened. 我想知道究竟出了什么事。
(adj.) wonderful (adv.) wonderfully
7．lie (lay lain lying lies) 位于，躺，平放
lie (lied lied lying lies) 说谎；谎言（n.）
lay (laid laid laying lays) 放置，下蛋
I found a letter __ ( http: / / www.21cnjy.com )_____(lie) on the floor when I came into the classroom.
When she came home ( http: / / www.21cnjy.com )several days later, she found that all things still _________where she had ____________them.
8．hang (hung hung hanging hangs)
Pen __________his head again, and his eyes were filled with tears.
佩恩又垂下了头，眼里满是泪。
Grammar（P12-14）
1．take up 占用（时间），占据（空间）take notice of 关注
take off (飞机)起飞；脱下；动身 take a look看一下 take a walk 散步
take action采取行动 ( http: / / www.21cnjy.com )take away带走，拿走，取走 take care of照顾；抚养
take...to...带...去... take photos照相，拍照 take over接受；接管
take a break休息一会儿 take down记下；拆卸 take notes做笔记；记录
take place发生；进行 take things as they come 既来之则安之 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
take on new challenges 接受新挑战
That big table ___________too much room.那张大桌子太占地方。
2．几分之几的表达方法
About_______________(九分之四) of the students_______(be) going to attend the meeting.
___________(四分之三) of our classmates are good at basketball.
_____________________(五分之二) of the children _____________(read) the book Alice in wonderland already.
Integrated skills, Study skills Task（P15-17）
look down 俯视 look after 照顾 look at 看……
look back回顾 look for寻找 look forward to盼望
look into调查 look like看起来像 look over检查
look in the eyes 注视 look away 转移目光
How high the building is! I can’t _____________.
Li Yan is such a he ( http: / / www.21cnjy.com )lpful girl that she always___________ my little sister while I’m away.
2．population
1) population常与定冠词the连用,作主语用时,谓语动词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )常用第三人称单数 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )形式。
The world's p ( http: / / www.21cnjy.com )opulation____ increasing faster and faster. 世界的人口增长得越来越快。
At the beginning of ( http: / / www.21cnjy.com ) the twentieth century, the world's population was about 1,7 billion.
在二十世纪 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )初,全世界的人口大约是十七亿。
2) 当主语是表示"人口的百分之几、几分之几"时,谓语动词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )用复数形式。
About seventy percent of the population in China _____ farmers.
中国大约有百分之七十的人口是农民。
3) 有时population可用作可数名词,其前可用不定冠词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。
China has a population of about 1.3 billion.
(=There is a population of about 1.3 billion in China.) 中国大约有十三亿人口。
New York is a big city with a population of over 10 million.
纽约是一个有一千多万人口的大城市。
4) 表示人口的"多"或"少",不用"much"或"little",而要用"large"或"small"。
India has a large population. 印度人 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )口众多。
Singapore has a small population. 新加坡人 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )口少。
5) 询问某国、某地有多少人口时,不用"H ( http: / / www.21cnjy.com )ow much... ",而用"How large... ";在问具体人口时用"What... "。
-How _______ is the population of your hometown 你们家乡有多少人口
-The population of our hometown is nearly twice as large as that of yours.
我们家乡的人口是你们家乡人口的将近两倍。
-______ is the population of Canada 加拿大 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )的人口有多少
-The population of Canada is about 29 million. 加拿大 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )的人口大约有二千九百万。
语法专项
一、it作人称代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
1．指代事物。it 可以指除人以外的一 ( http: / / www.21cnjy.com )切事物或动物。如：
Sam picked up some knowledge of the computer just by watching others working on it.
山姆 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )只是凭借看别人操作电脑就学到了一些电脑知识。(指the computer)
2．指代人。主要用于指婴儿或未知的人。 ( http: / / www.21cnjy.com )如：
I was just going to cut my rose bushes but someone had done it. Was it you 我正要剪切我的玫瑰丛但(发现)有人已经这样做了。是你干的吗？(未知的人)
3．代替某些代词。代词 it 还可用于代替指示代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )this, that 以及复合不定代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
something, anything等。如：- What’s this / that 这/那是什么？
- It’s an orange ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ). 这/那是一个橘子。
二、it作非人称代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
1．it用于指时间、距离、价值、自然现象 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、环境等。如：
It rained heavily in the south, causing serious flooding ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) in several provinces.
南方下了大雨，在几个省造成了严重洪灾 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。 (指自然现象 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ))
2．it指代前面提到过的或谈话双方都明白的事情或情况。
— Excuse me, I wonde ( http: / / www.21cnjy.com )r if you can help me — Sure. _______
A. What help B. What is this C. What is it D. What do you want
3．it组成的惯用语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。
take it easy ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) (别紧张，放松点)， make it (做到，成功)，
believe it or not (信不信由你 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ))， forget it (算了吧)，
manage it (设法做成某事)， that’s it (这就对了，就这样)，
Don’t mention it (不用谢)， It’s up to you ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) (由你决定)。
— According to my grandma, it is a good idea to eat chicken soup when you have a cold.
— _____________, scientists agree with her.
A. Sooner or later B. Once in a while C. To be exact ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) D. Believe it or not
三、it作形式主语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
当不定式 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、动名词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、从句等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )it。如：
It takes him half an hour to walk to school.
It is nice of you to help me so much.
It is said that he will go abroad.
Is it all right if I keep this photo 我留下这张相片可以吗？
The doctor thought______ would be good for you to have a holiday ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ).
A. this B. that C. one D. it
四、it作形式宾语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
当不定式 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、动名词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、从句等用作句子的宾语时，通常把它们放在句末，而用it作句子的形式宾语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。如： Wearing red can also make it easier to take action.
Comic strip &Welcome to the unit（P6-7）
1．It’s tiring to climb the steps and my feet hurt.
tiring adj. （事、物）令人疲劳的，使人厌倦的。
tired adj. (人 )感到疲劳
be ________ of 对……感到厌烦
It’s _________ for me to walk for 30 minutes. 走30分钟的路对于我来说很累人。
It was a ________day and she felt very _______. 那是疲劳的一天，她感到很累。
类似的形容词有：amazing/amaz ( http: / / www.21cnjy.com )ed exciting/excited boring/bored interesting/interested
step n. 台阶,步骤 You can go down the steps from here.
Bei ( http: / / www.21cnjy.com )ng honest is the first ______if you want to make friends with others.
v. 踩 I’m sorry to _____ on your foot.
hurt (hurt, hurt, hurting, hurts)
vt. 使受伤，损害 She hurt herself when she fell down. 她跌倒时伤了自己。
She hurt my feelings. 她伤害了我的感情。
Unluckily, he was badly hurt in the accident.
vi. 感到疼 My leg hurts.
n. 痛苦 The experience left me with a feeling of deep hurt.
这段经历给我心灵留下了严重的创伤。
2．There’s still a long way to go. ( to go 是动词不定式做定语。)
eg：a wonderful place ( http: / / www.21cnjy.com )to meet friends find someone to talk with
look for a room to live in
1) He is alw ( http: / / www.21cnjy.com )ays the first person ___________ (come) and the last one _______ (leave ).
2) There are many ( http: / / www.21cnjy.com ) interesting books _________ ( choose ) from, but I don’t know which to
borrow.
3) There is nothing ______________ (worry )about.
3． go on to do 一事做完，接着做另一件事
go on doing 事情暂停后继续做；一直做某事
go on with 后接名词或代词
1）After a short b ( http: / / www.21cnjy.com )reak ,he went on _________(read) the rest of the text.
2）After reading the novel , he went on _________(write) an article.
4. wake v. (woke, waken,waking,wakes) adj. awake
wake up your sister
wake (me/him/her/them/you…) up
Reading（P8-11）
1．used to do sth. 过去常做某事，现在不了
be used to (doing) sth. 习惯于某事或习惯于做某事。
get/become used to (doing) sth.
变得习惯于某事或习惯于做某事，往往含有“克服困难去适应”之意。
be used to do sth.
被用来做某事
be used for doing sth.
Wood is used for ( http: / / www.21cnjy.com )_________(make) paper.= Wood is used ________(make) paper.
木材被用来造纸。
My grandfather _________ living in the village. 我爷爷习惯住在乡下。
The food here is not so tasty but you will _____________that.
这里的伙食不怎么样,但你会习惯的。
2．( v.) turn…into…把……变成…… turn around转过来
turn to 转向；翻到(书的某一页)；向某人求救
turn left/right 左转/右转 turn red 变红 turn out结果是
turn up调高 turn down调低 turn on 打开 turn off关掉 turn back 这回
(n.) wait for your tur ( http: / / www.21cnjy.com )n 等轮到你 take turns/take it in turns 按顺序轮流
It’s one’s turn to do sth. 该轮到某人做某事了。
1)As a famous ( http: / / www.21cnjy.com ) cook, he can ______ these things ____ some delicious dishes quickly.
2)He ______________ his head as he heard someone calling him.
他转过头因为他听到有人在叫他。
3．It is worth a visit 它非常值得一游。
be worth sth be( well )worth doing
The music is well worth ______________.这音乐很值得一听。
The clock is hardly worth ___________(repair).Why not throw it away
4．watch the raising of the national flag 观看升国旗
raise （vt.）( raised raised raising raises) 举起，提高，升起，募集
rise (vi.) ( rose risen rising rises ) 上升，
The teacher said the sun __________in the east.
He _________his hands and asked a question.
He says the best way to __________ money is to sell newspapers.
The price of the house________________recently.
5．run (ran run running runs)
The road runs along the river bank.这条路沿着河岸延伸。
run after ( http: / / www.21cnjy.com ) 追赶 run away 逃走 run upstairs上楼 run to sb.向某人跑去
6．wonder ( n.) one of the___________ 奇迹之一
( v.) I wonder what really happened. 我想知道究竟出了什么事。
(adj.) wonderful (adv.) wonderfully
7．lie (lay lain lying lies) 位于，躺，平放
lie (lied lied lying lies) 说谎；谎言（n.）
lay (laid laid laying lays) 放置，下蛋
I found a letter __ ( http: / / www.21cnjy.com )_____(lie) on the floor when I came into the classroom.
When she came home ( http: / / www.21cnjy.com )several days later, she found that all things still _________where she had ____________them.
8．hang (hung hung hanging hangs)
Pen __________his head again, and his eyes were filled with tears.
佩恩又垂下了头，眼里满是泪。
Grammar（P12-14）
1．take up 占用（时间），占据（空间）take notice of 关注
take off (飞机)起飞；脱下；动身 take a look看一下 take a walk 散步
take action采取行动 ( http: / / www.21cnjy.com )take away带走，拿走，取走 take care of照顾；抚养
take...to...带...去... take photos照相，拍照 take over接受；接管
take a break休息一会儿 take down记下；拆卸 take notes做笔记；记录
take place发生；进行 take things as they come 既来之则安之 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
take on new challenges 接受新挑战
That big table ___________too much room.那张大桌子太占地方。
2．几分之几的表达方法
About_______________(九分之四) of the students_______(be) going to attend the meeting.
___________(四分之三) of our classmates are good at basketball.
_____________________(五分之二) of the children _____________(read) the book Alice in wonderland already.
Integrated skills, Study skills Task（P15-17）
look down 俯视 look after 照顾 look at 看……
look back回顾 look for寻找 look forward to盼望
look into调查 look like看起来像 look over检查
look in the eyes 注视 look away 转移目光
How high the building is! I can’t _____________.
Li Yan is such a he ( http: / / www.21cnjy.com )lpful girl that she always___________ my little sister while I’m away.
2．population
1) population常与定冠词the连用,作主语用时,谓语动词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )常用第三人称单数 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )形式。
The world's p ( http: / / www.21cnjy.com )opulation____ increasing faster and faster. 世界的人口增长得越来越快。
At the beginning of ( http: / / www.21cnjy.com ) the twentieth century, the world's population was about 1,7 billion.
在二十世纪 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )初,全世界的人口大约是十七亿。
2) 当主语是表示"人口的百分之几、几分之几"时,谓语动词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )用复数形式。
About seventy percent of the population in China _____ farmers.
中国大约有百分之七十的人口是农民。
3) 有时population可用作可数名词,其前可用不定冠词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。
China has a population of about 1.3 billion.
(=There is a population of about 1.3 billion in China.) 中国大约有十三亿人口。
New York is a big city with a population of over 10 million.
纽约是一个有一千多万人口的大城市。
4) 表示人口的"多"或"少",不用"much"或"little",而要用"large"或"small"。
India has a large population. 印度人 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )口众多。
Singapore has a small population. 新加坡人 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )口少。
5) 询问某国、某地有多少人口时,不用"H ( http: / / www.21cnjy.com )ow much... ",而用"How large... ";在问具体人口时用"What... "。
-How _______ is the population of your hometown 你们家乡有多少人口
-The population of our hometown is nearly twice as large as that of yours.
我们家乡的人口是你们家乡人口的将近两倍。
-______ is the population of Canada 加拿大 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )的人口有多少
-The population of Canada is about 29 million. 加拿大 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )的人口大约有二千九百万。
语法专项
一、it作人称代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
1．指代事物。it 可以指除人以外的一 ( http: / / www.21cnjy.com )切事物或动物。如：
Sam picked up some knowledge of the computer just by watching others working on it.
山姆 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )只是凭借看别人操作电脑就学到了一些电脑知识。(指the computer)
2．指代人。主要用于指婴儿或未知的人。 ( http: / / www.21cnjy.com )如：
I was just going to cut my rose bushes but someone had done it. Was it you 我正要剪切我的玫瑰丛但(发现)有人已经这样做了。是你干的吗？(未知的人)
3．代替某些代词。代词 it 还可用于代替指示代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )this, that 以及复合不定代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
something, anything等。如：- What’s this / that 这/那是什么？
- It’s an orange ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ). 这/那是一个橘子。
二、it作非人称代词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
1．it用于指时间、距离、价值、自然现象 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、环境等。如：
It rained heavily in the south, causing serious flooding ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) in several provinces.
南方下了大雨，在几个省造成了严重洪灾 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。 (指自然现象 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ))
2．it指代前面提到过的或谈话双方都明白的事情或情况。
— Excuse me, I wonde ( http: / / www.21cnjy.com )r if you can help me — Sure. _______
A. What help B. What is this C. What is it D. What do you want
3．it组成的惯用语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。
take it easy ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) (别紧张，放松点)， make it (做到，成功)，
believe it or not (信不信由你 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ))， forget it (算了吧)，
manage it (设法做成某事)， that’s it (这就对了，就这样)，
Don’t mention it (不用谢)， It’s up to you ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) (由你决定)。
— According to my grandma, it is a good idea to eat chicken soup when you have a cold.
— _____________, scientists agree with her.
A. Sooner or later B. Once in a while C. To be exact ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ) D. Believe it or not
三、it作形式主语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
当不定式 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、动名词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、从句等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )it。如：
It takes him half an hour to walk to school.
It is nice of you to help me so much.
It is said that he will go abroad.
Is it all right if I keep this photo 我留下这张相片可以吗？
The doctor thought______ would be good for you to have a holiday ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank ).
A. this B. that C. one D. it
四、it作形式宾语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )
当不定式 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、动名词 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )、从句等用作句子的宾语时，通常把它们放在句末，而用it作句子的形式宾语 ( http: / / www.21cnjy.com" \o "欢迎登陆21世纪教育网" \t "_blank )。如： Wearing red can also make it easier to take action.