it的所有用法总结全部

这是罗马数字

罗马数字元号

I - 1

II - 2

III - 3

IV - 4

V – 5

VI - 6

VII – 7

VIII - 8

IX - 9

X – 10

XI – 11

XII – 12

XIII – 13

XIV – 14

XV – 15

XVI – 16

XVII – 17

XVIII – 18

XIX – 19

XX – 20

XXI – 21

XXII – 22

XXVIII - 28

XXIX - 29

XXX - 30

XL - 40

L - 50

LX - 60

LXX - 70

LXXX - 80

XC - 90

XCIX - 99

C - 100 centum

CI - 101 centum et unus

CXCIX - 199

CC - 200

CCC - 300

CD - 400

D - 500

DCLXVI - 666

M - 1,000

MCMXCIX - 1,999

MM - 2,000

MMM - 3,000

MMMM - 4,000

MMMMCMXCIX - 4,999

I - 5,000

拼写规则

罗马数字共有7个，即I(1)，V(5)，X(10)，L(50)，C(100)，D(500)，M(1000)。按照下面的规则可以表示任意正整数。

重复数次：1个罗马数字重复几次，就表示这个数的几倍。

右加左减：在一个较大的罗马数字的右边记上一个较小的罗马数字，表示大数字加小数字。在一个较大的数字的左边记上1个较小的罗马数字，表示大数字减小数字。但是，左减不能跨越一个位数。比如，99不可以用IC表示，而是用XCIX表示。此外，左减数字不能超过1位，比如8写成VIII，而非IIX。同理，右加数字不能超过3位，比如14写成XIV，而非XIIII。

加线乘千：在1个罗马数字的上方加上1条横线或者在右下方写M，表示将这个数字乘以1000，即是原数的1000倍。同理，如果上方有2条横线，即是原数的1000000倍。

单位限制：同样单位只能出现3次，如40不能表示为XXXX，而要表示为XL。但是，由于IV是古罗马神话主神朱庇特（IVPITER，古罗马字母没有J和U）的首字，因此有时用IIII代替IV。

词典解释

IV n 自变数(初始速度)

IV abbr 1 =intravenous; intravenously

iv abbr 1 =increased value 增加值

2 =intravenous

3 =invoice value 商发票价值

罗马数字 四／第四

湘雅医学专业词典

[=ichthyosis vulgaris](拉)寻常鳞癣,普通鳞癣

[=in vacuum]真空中

[=in vitro]试管内,活体外

[=in vivo]活体内

[=increase value]增加值

[=independent variable]自变量,自变数

[=influenza virus]流感病毒

[=infusion needle]静脉输液针

[=interventricular](心)室间的

[=intervertebral]椎(骨)间的

[=intravascular]血管内的

[=intravenous]静脉内的

[=intraventricular](心)室内的

[=invasive]侵袭的,侵入的,侵害的,发病的

[=inverted papilloma]内翻性乳头(状)瘤

[=iodine value]碘值

X-JAPAN同名单曲

单曲介绍

《IV》是日本摇滚乐队X-Japan于2008年1月23日发行的一支可于网络下载的单曲，这是乐队自1998年的《The Last Song》以来发行的第一支单曲。《IV》是**《Saw IV》的主题曲，于2007年10月26日发行。

日语歌词及翻译

Needles are piercing through my skin

I'll tell you the feeling what it's like

Is life just all about deception

Please don't be a part of a fairy tale,

but you're so young to play with thy own will

Should I trade the breath of my life for freedom

(In the rain) I'm calling you, dear

(Find the way) Can't you see me standing right here

(Feel my pain) Life's bleeding from fear

(Find its place) I will give it straight from my vein

Needles are piercing through my skin

I don't fear the fucking life

This never meant I can't sit by

They say as if it takes me somewhere

Just let me swallow the faith by injection

Life better be rushing to my head, my love

I've played with this game before to find a piece of my true self!

I'm lost within!

(In the rain) I'm calling you, dear

(Find the way) Can't you see me standing right here

(Feel my pain) Life's bleeding from fear

(Find its place) I will give it straight from my vein

I'm feeling my pain

Do you feel where it's been

Can you cope with history of the world,

when it's sad part of life

Can set the shadows fade,

forever fade away

I'm calling you, dear

Can't you see me standing right here

Life's bleeding from fear

I'll give it straight from my vein

(In the rain) I'm calling you, dear

(Find the way) Can't you see me standing right here

(Feel my pain) Life's bleeding from fear

(Find its place) I will give it straight from my vein

针，渐渐刺穿我的皮肤

我将告诉你那是一种怎样的滋味

是不是生活就是欺骗的代名词

别，请别只停留在幻想的童话世界

但你还太年轻，还无法背负自己的意念面对残酷的生活

我是否应该交易自己的生命，换取所谓的自由

亲爱的，我在雨中呼唤你

你难道不能找到一种方式去发现我的存在

生活因恐惧的疼痛而血流不止

我想我会从我的掌纹之中找到生活的方向

针，渐渐刺穿我的皮肤

但我却无法感觉这该死的生活究竟在何方

但这并不意味着我不能袖手旁观，放任生活前行的方向

他们说我被带向了不知名的远方

可不可以将我的信念伴随着这样一次注射，永久地驻留在我的体内

让我找到真爱，让真爱融入我的灵魂

我曾这样尝试着却找回真正的自己

但我却迷失与其中

亲爱的，我在雨中呼唤你

你难道不能找到一种方式发现我的存在

生活因恐惧的疼痛而血流不止

我想我会从我的掌纹之中找到生活的方向

我承受着痛苦的煎熬

但你是否知道，这痛苦源于何方

你能否抚慰往日的伤口，当它匿藏于生活的黑暗

你能否抹去这层黑暗

让它永远地消失

亲爱的，我在雨中呼唤你

你难道不能找到一种方式去发现我的存在

生活因恐惧的疼痛而血流不止

我想我会从我的掌纹之中找到生活的方向

it的所有用法总结如下：

I．It 作形式主语的句型

①It + be + adj(kind , wise , careless, clever…) + of sb to do sth

Eg: It is wise of him to make such a decision他做出这样的决定是明智的。

②It + be + adj(easy , safe , common , normal …)+ for sb to do sth

该句型中adj若为important, necessary, natural, possible, strange, vital, essential等可改为从句,从句用should+动词原形。

Eg: It’s very dangerous for children to play with fire

It is important for us to learn English well (= It is important that we (should) learn English well)

③ It + be +V-ed(reported,believed, said, suggested…)+ that 从句

该句型中：⑴若V-ed为reported, believed, said等常译为“据报道”，“据认为”，“据说”。⑵若V-ed为suggested, ordered, demanded, insisted等表示“建议”,“命令”的词，从句要用虚拟语气(should)+动词原形。

Eg: It is suggested that the book (should) be revised

It’s said that Tom has been back from abroad (=Tom is said to have been back from abroad)

④ It + be + n (a pity, a shame, a fact , good news…)+ that 从句:

该句型中，从句一般用(should) + 动词原形，表示出乎意料，常译为＂竟然＂。

Eg: It is a pity that such a thing ( should ) happen in your class 这种事竟然发生在你们班上，真是遗憾！

⑤ It is useless/no use/no good /pleasure+ doing sth

此句型中的it是形式主语, 其后的动名词短语是真正的主语,译为“做…没有用”。

Eg : It ‘s useless arguing with him further // It’s no use talking with him, because he won’t listen

⑥ It takes sb to do sth

该句型中it是形式主语，真正的宾语是to do sth，常译为＂做……要花费某人……＂。

Eg: It took thousands of people many years to build the Great Wall

II．It 作形式宾语的句型

1sb find/ believe/ think/ feel/ consider/ make + it +n/adj +to do或从句

该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6 指主句中常用的动词：think, believe, make, find, consider, feel；1 指的是形式宾语 it；2 指的是宾补的两种形式：形容词或名词；3 指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。

Eg: We think it our duty to clean our classroom every day

He felt it important learning English well

They found it difficult that they would finish their work in two days

2主语＋hate / dislike / love / like ＋it ＋when－从句

Eg: I hate it when people speak with their mouths full

3 主语＋appreciate ＋it ＋if－从句

Eg: I really appreciate it if you could help me with my math

4 sb depend on/count on/rely on/see to(负责，确保)/ answer for it that…

Eg: You may rely on it that he won’t be late

You must see to it that the doors are locked before you leave the lab

5 sb take it for granted that… 认为……是理所当然的

Eg: I take it for granted that he will succeed

IIIIt 引导的时间句型

⑴ It + is/has been+ 时间段+ since引导的时间状语从句:

该句型中从句一般用过去时态，句意为“自从以来已多久了”

Eg : It is 5 minutes since the bus left 公汽开走已有5分钟了

⑵ It + be（will/was）+ 时间段 + before引导的时间状语从句:

该句型中，主句谓语动词be若为肯定式，意为“过多久才”；若为否定式时，意为“没过多久就”。

Eg : It will be long/ 3 hours before he comes back要过三个小时他才会回来

It was 3 hours before he came back 过了三个小时他才回来

⑶ It + be + 时间点+ when引导的时间状语从句

这个句型中, it 代指时间，表示时间点的词前没有介词。

Eg : It will be Monday when he comes back 他周一的时候回来

It was Monday when he came back 他周一回来的

对比：It was on Monday that he came back (强调句)

⑷ It + is (about/high) time + (that) sb did/should dosth

意为“该是某人做…的时候了”， about/high是用于加强语气，that从句用should或动词一般过去时表虚拟。

亦可转换成 It + is+ time +(for sb )to do sth

Eg : It’s (high/about) time (that) we handed in/should hand in our homework

⑸ It / This / That +is+ the first(second …) time + that sb has done sth:

意为“这是某人第…次做…”，注意time前有序数词，主句是 is 时 ，从句要用现在完成时；如果主句用was ，则从句须用过去完成时。 Eg : It is the third time that I have seen the film

That was the second time that I have been there

IV．It 引导的强调句

强调句形式：It + is/was +被强调的部分+ that/who从句

Eg: It was last week that I met an old friend in the street // It was because he was ill that he didn't come to school yesterday

(强调原因状语从句时，只能强调由because所引导的从句)

判断方法：将It is/was和that去掉，若该句是一个完整无缺的句子即为强调句

常考考点：

①强调句型中的主谓一致Eg: It is you，rather than he，that are to blame for the accident．

②插入从句的强调句型 Eg: It was in the restaurant where we had dinner last Sunday that you left your wallet．

③强调句型的一般疑问句、特殊疑问句形式

一般疑问句：Is / Was it + 被强调部分+ that + 句子其余部分 Eg: Was it in 1933 that the Second World War broke out

特殊疑问句：疑问词+ be + it + that + 句子其余部分Eg: When was it that he changed his mind to take part in the activity？

④强调句型用于名词性从句, 尤其注意要使用陈述语序。

Eg: I don’t know when it was that he changed his mind to take part in the activity？

⑤not until用于强调句型 It is / was not until ＋被强调部分＋ that ＋其他部分

Eg : It was not until midnight that she went back home

此句型只用until，不用till。但如果不是强调句型，till和until可通用。因为句型中It is / was not已经是否定句了，that后面的从句要用肯定句。

V．It其他常见用法：

It looks / appears as if 看起来好像……It looks as if she is ill

It seems that 似乎…… It seems that he will be back in a few days

It turns out that 原来是…… It turned out that the beautiful woman was a thief

It occurs to/strikes sb that… 突然想到……It occurred to me that I hadn’t locked the door

It happened that 碰巧…… It happened that he met his teacher in the street

It doesn’t matter whether/if…无论是…没关系 It doesn’t matter whether he will come or not

It is no wonder that 难怪… He works so hard It’s no wonder he could pass the exam

How did it come about that … “……怎么发生的？” How did it come about that his bike was thrown into the river

It all depends/that all depends那得看情况

It's up to sb由……决定，由……负责，取决于……

as it is (1)事实上，实际情况是……; (2)照原样

make it成功、做到、说定

Believe it or not信不信由你

Get it 明白了

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