It is three dollars.
指天气
指时间
指日期
指距离
指价值
指温度
It was nearly midnight when she came back.
It is some 3000 kilometers from Beijing to Guangzhou.
Today it is 30 degrees centigrade.
其他用法
1.It is time ( about time 、high time ) that从句(虚拟语气动词用did/had done/should do)
①It is time that children went to bed. ②It is time you bought a new car. ③It is (high ) time you made up your mind.
作形式宾语
该句型中的it 作形式宾语，该结构中常用的动词有：think, believe, make ,find, consider, feel如 ①We think it our duty to clean our classroom every day. ②He felt it important learning English well. They found it difficult that they would finish their work in two days. ④The Internet makes it easier for companies to keep in touch with customers.
You are kind to say so.
不定式的逻辑主语是由for引起，主 句中的形容词通常是表示重要性， 紧迫性，频繁程度，难易，安全等 情况的中性形容词。 常见的形容词有： important ， necessary ， natural easy ，safe ，common ，normal ， hard ， difficult ， dangerous ， unusual ， rare ， impossible ，
It is kind ( of sb. ) to do sth.
It is necessary ( for sb. ) to do sth. .
It takes sb. ... to do sth.
作形式主语替代动名词短语
It is no good / no use / useless doing sth. 常译为“┅有好处或没有用” ①It is no good learning English without speaking English. ②It's useless trying to argue with Shylock.
It的特殊用法小结
应用学科：英语 应用学段：高中通用
目录
CONTБайду номын сангаасNTS
01 人称代词 02 非人称代词 03 形式主语、形式宾语 04 其他用法
1.基本用法，指 代无生命的或者 动物“它”
人称代词
2.指代不知道性 别的婴儿
非人称代词
非人称代词
It is a lovely day, isn’t it? It is April First today.
said (reported/believed/known/told/ thought/ hoped) +that …… 从句常译为＂据说（据报道．）＂
It is said that he has come to Beijing.
suggested ( advised/ ordered / demanded/ insisted/ commanded... ) that 从句.that后的从句要用虚拟语气（should + 动词原形）should 可以省；常译为＂据建议；有命令．） It is suggested that the meeting( should ) be put off.
pleasant 如:It is important for her to come to
the party. = It is important that she
(should ) come to the party.
It took thousands of people many years to build the Great Wall.
3.It is no good / no use / useless doing sth. 常译为“┅有好处或没有用” ①It is no good learning English without speaking English. ②It's useless trying to argue with Shylock.
形式主语、形式宾语
作形式主语，替代主语从句
clear ( obvious, true, possible，certain....) that从句 It is very clear that he’s round and tall like a tree.
It be+
important ( necessary，right，strange，natural...) that It is necessary that he (should) remember these words.
作形式主语替代不定式
不定式的逻辑主语是由of引起，主句中 的形容词必须是能表示逻辑主语特征 的褒义或贬义形容词。常见的词有： bad ,brave ，careless，clever，cruel， foolish ， good （ 好 心 的 ） ， honest ， horrible ， kind ， lazy ， modest ， naughty ，nice（有教养的），polite， rude，silly ，stupid ，wise ，wrong （错误的）等。 这个句型可以改写为：sb. is kind to do sth. 如:It is kind of you to say so. =
2.It is the first ( second ... ) time that从句(从句用现在完成时have done ) It was the first ( second ... ) time that从句(从句用过去完成时had done )常译为＂是第一 （二）次＂。 It is the first time I have been here. = This is the first time I have been here.