it ,one ,that 的用法及区别？

consider, think, make, find, believe, count, declare, deem, fancy, feel, guess, imagine, judge, prove, see, show, suppose, understand, take

● We consider it our duty to support good leaders

● I think it best to get along well with others

● The new method makes it possible to complete the task faster

● Tom found it very embarrassing to be reminded of the long-standing debt

● Susan deemed it advisable to keep the matter secret

● We all feel it nice to be able to visit that distinguished university

● Who can prove it wrong to have a "make-money-quick" mentality

这些IT句型的不定式动词短语前，也可用上“for”的片语，如：

● Many Chinese here find it necessary for them to have a better command of Chinese

● They thought it desirable for English to be accurately used

● Such a plan makes it possible for older workers to be re-trained as useful staff

二、IT在一些惯用语中出现：

Takein turns; leaveto; oweto; takeupon oneself to，如：

● Can you do all together I think you have to take it in turns

● I will leave it to you to assign the duties to the staff

● Paul owed it to Susan to explain the matter

● How can John take it upon himself to do all the chores

除了代替不定式动词短语之外，IT也可以代替动名词与动名词短语成为句子的宾语。例如：

●I do not consider it worthwhile spending too much time on telephone conversation

●She found it troublesome having to go through all the red tape

●Peggie deemed it tedious writing two or three drafts for an English composition

●Do you think it useful changing for the sake of changing

Have a nice day!

it 可以用来指代时间、距离、人物,可以代替不定式、动名词（作形式主语）也可以用来指代前文提到过的某一事物；eg it is seven o'clock now(时间)it is 400 miles from A to B(距离)do you really like it(前文提到

it/one/that

的用法和区别

I

it／one

／that三者均可用作代词,

指代前面提到的名词。一般说来,

it指代同名同物;

one与that则指代同名异物。

I

have

lost

my

umbrella;

I'm

looking

for

it

（该句中it就是指前面的my

umbrella）

I

have

lost

my

umbrella;

I

think

I

must

buy

one

（one在该句中表泛指,

因为my

umbrella已经丢了）

The

umbrella

you

bought

is

cheaper

than

that

I

bought

（替代词that在该句中特指“the

umbrella

I

bought”,

以区别“the

umbrella

you

bought”）

II

one与that虽可用来指代同名异物,

但one为泛指,

相当于a／an＋名词;

that为特指,

相当于the

＋名词。所以one所指代的名词的修饰语一般为

a／an

／some

／any;

that所指代的名词的修饰语往往是the

／this

／that。

A

chair

made

of

steel

is

stronger

than

one

made

of

wood

（该句中one可以换成a

chair）

The

water

in

the

cup

is

hotter

than

that

in

the

pot

（该句中that可以换成

the

water）

III

one只能代替可数名词单数,

代替可数名词复数时用ones;

that既可以代替不可数名词也可以代替可数名词单数,

代替可数名词复数时用

those。

I

like

this

pen

more

than

that

one

（one代替可数名词单数pen）

There

were

a

few

young

people

and

some

older

ones

in

the

house

（ones代替可数名词复数people）

Mary's

handwriting

is

far

better

than

that

of

Peter

（that代替不可数名词

handwriting）

These

pictures

are

more

beautiful

than

those

（those代替可数名词复数

pictures）

IV

one既可代替事物,

也可代替人,

that只能代替事物而不能代替人。有时可以用the

one或the

ones代替that或those。

The

one

／That

on

the

table

is

mine

（该句中The

one代替事物,

并且也可以用That）

He

is

the

teacher,

the

one

who

is

loved

by

the

students

（该句中the

one代替人,

不能用that）

He

advised

the

farmers

to

choose

the

best

seed-heads,

the

ones

／those

that

had

the

best

color

（该句中the

ones代替事物,

并且也可以用those）

V

one一般有前置修饰语,

有时也可有后置修饰语或不用修饰语。而

that不能有前置修饰语,

但可有后置修饰语。

Cook

was

a

strict

but

good

captain,

one

who

took

good

care

of

his

sailors

The

water

in

the

well

is

cleaner

than

that

in

the

river

VI

it可以替代句中的不定式或从句等,

充当形式主语或形式宾语。one与that均无此用法。

It

is

known

to

everybody

that

the

moon

travels

around

the

earth

once

every

month

I

found

it

hard

to

get

on

with

her

VII

it与that均可以替代上文全句的内容或部分内容,

而one

／ones则不可以。

He

has

saved

my

life;

I'll

never

forget

it

（it代替第一分句）

Tom

is

painting

his

house

I

am

told

he

does

it

every

four

years

（it代替前面分句的部分内容painting

his

house）

Let's

say

we

meet

here

at

three

o'clock

That

ought

to

give

you

time

to

buy

everything

（That代替前面表述的内容）

it 作形式宾语有几种形式： It 代替不定式短语时： 1 He feels it his duty to help others （他觉得帮助他人是他的责任。） 2 The new medicine makes it possible to treat this terrible disease （这种新药使治疗这种可怕疾病成为可能。） It 代替动名词短语时： 1 We thought it no use doing that （我们认为那样做无济于事。） 2 Our teacher thinks it no good learning without practice （我们的老师认识光学不实践是没有好处的。） It 代替宾语从句时： 1 I think it very important that we take part in the discussion （我认为我们参加这次讨论是很重要的) 2 Didn't I make it clear to you that I was not coming ( 我不是向你明确表示过我不来了吗？） 这个具体的判断方法，肯定是看it后面有没有跟读短语，句子之类的。一般宾语比较长或者是想突出强调，通常是动词后面直接跟it，后面补充说明it的具体内容。

一、It用作实词

表达以下概念:指代前文提到的事物，前文中的this, that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象。

二、It用作形式主语

替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。

It 作形式主语的常见句型：1 代作主语的动词不定式，其句型为（1）It be adj (for sb) to do sth

（2）It be adj of sb to do sth

（3）It替代作主语的动名词的常见句型：

It’s no good/use doing…

It’s (well)worth doing…

It’s (well)worth one’s while doing/to do It’s (well)worth while doing/ to do

2 It替代作主语的从句常见句型

（1）It is + noun +从句

（2）It is adj +clause

It’s surprising that… (should)………竟然……

It’s a pity/shame that…(should)………竟然…

（3）It verb sb + clause= It is v-ing + clause

It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb that…

（4）It verb (to sb) that…= sb/sth verb to do

(verb = appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out , work out)

（5）It is v-ed that…=sb/sth is to do

(verb=say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know）

四、It 作形式宾语

用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。

It 作形式宾语的常见句型：

1 verb+ it+ adj/noun (for/of) to do/clause (verb=think, believe, suppose, consider, feel, make, keep…)

五、强调句型

It is/was+被强调部分+ that(who)… 强调句型用来强调谓语动词以外的任何句子成分。当被强调部分是人时也可以用who。

在使用强调句型时需注意以下几点：

1 请注意强调句型的特殊疑问句

2 在强调原因状语从句时，只能强调由because所引导的从句。

3 在强调not … until结构时必须把not与until一起放到被强调的位置上。

4 注意强调句型与定语从句的区别。

六、It 常用的固定搭配

1 make it

(1)在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达

翻书找的笔记 不采纳对不起我手打

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