(共19张PPT)
Unit 3 A healthy life
Grammar--it 用法小结
Appreciation:
1.It is never too old to learn.
2. It never rains but it pours(泼水).
3. It takes three generations (代) to make a gentleman.
不鸣则已,一鸣惊人
1. it作人称代词
⑴. 指前文提到的事物,以避免重复:
Shantou is a beautiful city, isn’t it
⑵. 指不明性别的婴儿或不明身份的人:
Look,that’s a baby! It looks like a doll.
Is this your wallet No, it isn’t.
⑶.代替指示代词this/that
There is a cat on the desk. It looks like a hat.
Who is knocking at the door It must be Bill.
1. It was very cold yesterday.
2. It is about 15:00 now.
3. It is about 5km from my home to the park.
4. It’s quite noisy here.
5. Her baby’s due date is next month, and she hopes it will be a boy.
6. It lies in the west of school.
environment
weather
time
distance
People
direction
2. it作非人称代词
注意: it, one和that,作替代词的区别
(1)The book in your bag is very interesting. Can I borrow______
(2) The book in your bag is more interesting than ______ on the desk.
(3) The weather here is much colder than_____ in Nanjing.
it 同名同物
that 同名异物 特指= the +n.(单数)
one 同名异物 泛指=a/an+n.(可)
those 同名异物 特指 =the+n.(复数)
ones 同名异物 泛指 (可复)
1. We think it our duty to clean our classroom.
2. I felt it no use arguing with him.
3. They found it difficult that they would finish their work in two days.
4. I consider it very interesting to study English.
5. He made it a rule that we should keep silent in class.
observe and think
6个主句中常用的动词:think,believe,make,find,consider,feel;
1 形式宾语it;
2 宾补的两种形式:形容词或名词;
3 真正宾语的三种形式:
①不定式短语 ②动名词短语 ③that引导的宾语从句
1.It做形式宾语
it 作形式宾语,记忆方便---“6123结构”。
总结:主语+动词+it +adj./n.+(for sb.) to do/doing/that从句
I hate it you can dance so well but I can't.
I would appreciate it if you lend me some money.
I enjoy it when we are bathing in the sunshine.
He decided on it where we would go this weekend..
observe and think
I like___in the autumn when the weather is clear and bright.
A. this B. that C. it D. one
点拨:这是it作形式宾语的一种特殊用法.少数动词(如like, love, enjoy, dislike, hate, appreciate等)或包含介词的动词短语(如see to, depend on等)后接宾语从句,必须先由it担任形式宾语,再接从句.
I like (enjoy, hate…) it when….
I would appreciate it if…
…see to 确保务必(depend on…) it that…
Sentence patterns:
C
形式宾语特殊用法1
动词 +it + to sb. + that…
owe it to sb. that…把…归功于…
leave it to sb that…把…留给某人去做
take it for granted that 把…想当然
keep it in mind that… 把…记在心里
他想当然地以为女朋友会再回来。
He took it for granted that his girlfriend would come back again.
形式宾语特殊用法2
It is amazing that at my age I'm still fit.
2. It is difficult to get up early.
3. It is no good crying over spilt milk.
小结2:“It” 可用来作_______代替后面的真正主语,真正主语可以是___________
observe and think
形式主语
1. It is / was + adj. + ( for/of sb. ) to do sth. / that
2. it is/was + 名词词组 + that
3. it is/was + p.p+ that
4. it + 不及物动词 + that (appear/follow/happen/occur/seem turn out)
5. it is/was +n./adj. +doing (no good/no use /useless/ worthwhile/a waste of +n.)
1. It is/was the first ( second ... ) time that ...
It is the first time I have been here.
It was the first time I had been here.
2. It is (high/about)time (for sb) to do / that + (v.过去时/should +do) …
1.It is time that we (clean) the house.
3. It takes sb. +时间 to do sth. 花某人时间做…
It took thousands of people many years to build
the Great Wall.
四、特殊句型中的it
强调句结构:It is / was + 被强调部分(主,宾,状语) + that /who+ 剩余部分
一般疑问句:Is /was it + 被强调部分(主,宾,状语) + that/who + 剩余部分
特殊疑问句: Wh- + is / was it that + 剩余部分?
固定强调句式:It was not until … that…(直到…才…)
4:IT用在强调句中
Exercises 1:单句改错
1. It is in that factory where “Red Flag” cars are made.
2. It was him that showed me how to smile in the hard time.
3.It is what you do rather than what you say that matter.
4.It is not until you have lost your health when you know its value.
Exercises 2考点:区分强调句型与其他从句
1.It was in the river he often swam .
2.It was the river he often swam.
3.It was on Sunday the strangers came to our village.
4.It was Sunday the strangers came to our village.
that
where
when
that
5.It be ... before ...
It was three hours before he got there.
It will be three hours before we meet again.
It will not be three hours before we meet again.
总结:
It was+时间段+before+主语+动词过去时“过了若干时间才”,
It will be+时间段+before+主语+动词一般现在时
“要过 若干时间之后才”,
It + won’t be + long before 表示" 用不了多久就会
it 的用法
做人称代词
做非人称代词
做形式主语
做形式宾语
特殊句型中的it
代词
引导词
1,尊敬老人是我们的传统美德.(virtue)
2, 抱怨失去的东西是没有用的。(complain )
3,很明显的是玩游戏严重影响了他的视力.(eyesight)
4,大家都知道:有志者,事竟成。
5,对我们来说拥有平衡的饮食是重要的。
6,医生挽救了这么多人的生命,他们真是太无私了。
7. 该是我们采取有效的措施保护环境的时候了。
8. 是你无私的帮助让我有勇气面对生活的困难。