语法—it的用法
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night.
4. It is / has been + 段时间(years, days, weeks, months,
etc.) + since-clause
本结构表示某一动作或状态从结束时起到现在或另一过去 时间为止的若干时间。译为 “自从…以来有…(时间)” 特别注意： 1)since 从句用一般过去时。
Unit 3 A Healthy Life
Grammar the usage of “it”
It is never too old to learn.
活到老,学到老。
It is no use crying over spilt milk. 覆水难收。 It is easier to say than to do 说起来容易做起来难
-It is kind of you to say so.
= You are kind to say so.
3). It is necessary ( for sb. ) to do sth. 对某人来说做某事… 常见的形容词有：① important， necessary， natural ,strange ② easy ， safe ，common ，normal ， hard ， difficult ,dangerous ， 等。 在①中的形容词作表语
♦ It 引导的几个易混的时间句型
1. It’s ( about / high) time (that) …
2. It + is / was + the first (second …) time + that-clause
3. It was / will (not) be + 段时间(hours, days, years, etc) + before-clause 4. It is / has been + 段时间(years, days, weeks, months, etc.) + since-clause 5. It is / was + 具体的时间点 + when-clause
it 为形式宾语，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
2). It is kind ( of sb. ) to do sth. 某人做某事真…
主句中的形容词必须是能表示逻辑主语特征的形容词。 常见 的有： bad ， brave ， careless， clever ， cruel ， foolish ， stupid ， wise wrong等。 这个句型可以改写为：sb. is kind to do sth. 。
1. It’s ( about / high/right) time (that中，time 之后可接介词短语、动词不定式或 that 从
句。 特别注意： 在从句中，谓语动词须用虚拟语气，即“should + 动词原 形”(should 不能省)或用动词的过去式。
可以用从句改写， 如：
It is important for her to come to the party.
= It is important that she (should ) come to the party.
5.3.作形式主语替代ing形式 It is no good (use ) doing sth. 做某事没有好处/没有用 该句型中的真正主语是动名词短语。
e. g. It is / has been five years since I began to learn English.
2) 在It is time since-clause 中，since 从句中不能否定式。 e. g. 正：It is / has been three years since I met you in London last. 误：It’s ten years since you didn’t come to see me.
1）It is + adj. +that从句
① It is clear ( obvious， true， possible ，certain....) that ..... “很清楚（显然, 真的, 肯定…）” -It is very clear that he’s round and tall like a tree.
施比受更有福。
高考真题回顾
(2011.湖北高考.改编) It was not until he waited for two years ___________________________ by the manager. that his plan was approved of
直到他等了两年后，经理才同意他的计划。
last year. This is the fourth time that she has rung you today.
3. It was / will (not) be + 段时间(hours, days, years, etc.) + before-clause 要过…才…
本结构中表示某一动作从现在起到将来某时刻之前发生的这 一段时间的总和，也可表示某一动作从过去某时刻起直到另
常译为“据建议；有命令…”
-It is suggested that the meeting ( should ) be put off.
3）. It is a pity ( a shame ... ) that ... 真可惜/真令人羞愧…
后常用（should + 动词原形），should可省去．表示出乎意
street.
It seems that he will be back in a few days.
5.2.作形式主语替代不定式 1). It takes sb. ... to do sth. 做…要花费某人… -It took thousands of people many years to build the Great Wall.
多漂亮的宝宝啊！是个男孩吗？
4．用作非人称代词，表示时间、日期、天气、温度、距离 等，常用作句子的主语。 -It is Saturday today. 今天是星期六。 -It's two kilometers from school to my home.
从我家到学校有两公里远。
5. it 用作形式主语 5.1 做形式主语代替主语从句
-It is no good learning English without speaking English.
-It's useless trying to argue with Shylock.
6. It 作形式宾语. -We think it important to learn a foreign language.
料，常译为“竟然”。表达惊讶或气愤的语气，如果不是表
达一种语气则不用。 -It is a pity that such a thing ( should ) happen in your class. -It is a pity that he is ill.
4). It happens (seems， looks， appears ) that... 碰巧/看来… 该句型中it是形式主语，that 引导的是主语从句，主句 中的happen ， seem等词是不及物动词。 It happened ( so happened ) that he met his teacher in the
-It is said that he has come to Beijing.
②. It is suggested ( ordered/demanded/insisted/commanded... ) that ... 主句中的过去分词是表示请求，建议，命令等词时，that后 的从句要用虚拟语气（should + 动词原形），should 可以省。
②. It is important ( necessary, strange， natural自然的 )that ...
that 后的从句中要用虚拟语气（should ）+ 动词原形。
-It is important that we (should) learn English well.
2）. It is +v-ed +that 从句 ① It is said (reported， believed，announced....) that ... 据说（据报道，据信, 据报道．．．）
e. g. It’s (about) time that we went / should go to bed.
It’s (about) time for us to go to bed.
2. It + is / was + the first (second …) time + that-clause
导的宾语从句。
-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.
这/那是第…次/天/月/年…
本结构中，It 也可用 this, that 等，其中序数词也可修饰 day, month, year 等名词。 特别注意： 前面是is,从句用现在完成时；前面是was, 则从句用过去完成时。
e. g. It was the second time that I had visited the Great Wall
一过去时刻发生之前的若干时间。
特别注意： 1)主句部分用 was ，before 从句用过去时。 2)主句部分用 will be，则 before 从句用现在时。 e. g. It will be two years before we meet again.
It was a long time before I got to sleep again last
It is the first step that costs.
万事开头难。
It is hard to please all. 众口难调
It takes three generations to make a gentleman.
十年树木,百年树人。 It is easy to open a shop but hard to keep it always open. 创业容易守业难 It is better to give than to take.
1．用作人称代词，代替前面提到的事物或人，在句子中作
主语或宾语。
-Your story is interesting，but I don't like it.
你的故事很有趣，但是我不喜欢。
2．用于疑问句的答语中，代替指示代词(this，that)。
－What's this? 这是什么？
－It's a panda.是只熊猫。 －Whose exercise book is that? 那是谁的练习本？ －It's hers.是她的。 3．当说话者不清楚或没必要知道说话对象的性别时，也 可用it 来表示。 What a beautiful baby! Is it a boy?
5. It is / was + 具体的时间点 + when-clause
本结构是定语从句句型，具体的时间点是先行词，关系
副词 when 引导定语从句。译为“当…的时候是…(时间)” 特别注意： 1)主句部分用 is ，when 从句用现在时。 2)主句部分用 was， when 从句用一般过去时。
4. It is / has been + 段时间(years, days, weeks, months,
etc.) + since-clause
本结构表示某一动作或状态从结束时起到现在或另一过去 时间为止的若干时间。译为 “自从…以来有…(时间)” 特别注意： 1)since 从句用一般过去时。
Unit 3 A Healthy Life
Grammar the usage of “it”
It is never too old to learn.
活到老,学到老。
It is no use crying over spilt milk. 覆水难收。 It is easier to say than to do 说起来容易做起来难
-It is kind of you to say so.
= You are kind to say so.
3). It is necessary ( for sb. ) to do sth. 对某人来说做某事… 常见的形容词有：① important， necessary， natural ,strange ② easy ， safe ，common ，normal ， hard ， difficult ,dangerous ， 等。 在①中的形容词作表语
♦ It 引导的几个易混的时间句型
1. It’s ( about / high) time (that) …
2. It + is / was + the first (second …) time + that-clause
3. It was / will (not) be + 段时间(hours, days, years, etc) + before-clause 4. It is / has been + 段时间(years, days, weeks, months, etc.) + since-clause 5. It is / was + 具体的时间点 + when-clause
it 为形式宾语，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
2). It is kind ( of sb. ) to do sth. 某人做某事真…
主句中的形容词必须是能表示逻辑主语特征的形容词。 常见 的有： bad ， brave ， careless， clever ， cruel ， foolish ， stupid ， wise wrong等。 这个句型可以改写为：sb. is kind to do sth. 。
1. It’s ( about / high/right) time (that中，time 之后可接介词短语、动词不定式或 that 从
句。 特别注意： 在从句中，谓语动词须用虚拟语气，即“should + 动词原 形”(should 不能省)或用动词的过去式。
可以用从句改写， 如：
It is important for her to come to the party.
= It is important that she (should ) come to the party.
5.3.作形式主语替代ing形式 It is no good (use ) doing sth. 做某事没有好处/没有用 该句型中的真正主语是动名词短语。
e. g. It is / has been five years since I began to learn English.
2) 在It is time since-clause 中，since 从句中不能否定式。 e. g. 正：It is / has been three years since I met you in London last. 误：It’s ten years since you didn’t come to see me.
1）It is + adj. +that从句
① It is clear ( obvious， true， possible ，certain....) that ..... “很清楚（显然, 真的, 肯定…）” -It is very clear that he’s round and tall like a tree.
施比受更有福。
高考真题回顾
(2011.湖北高考.改编) It was not until he waited for two years ___________________________ by the manager. that his plan was approved of
直到他等了两年后，经理才同意他的计划。
last year. This is the fourth time that she has rung you today.
3. It was / will (not) be + 段时间(hours, days, years, etc.) + before-clause 要过…才…
本结构中表示某一动作从现在起到将来某时刻之前发生的这 一段时间的总和，也可表示某一动作从过去某时刻起直到另
常译为“据建议；有命令…”
-It is suggested that the meeting ( should ) be put off.
3）. It is a pity ( a shame ... ) that ... 真可惜/真令人羞愧…
后常用（should + 动词原形），should可省去．表示出乎意
street.
It seems that he will be back in a few days.
5.2.作形式主语替代不定式 1). It takes sb. ... to do sth. 做…要花费某人… -It took thousands of people many years to build the Great Wall.
多漂亮的宝宝啊！是个男孩吗？
4．用作非人称代词，表示时间、日期、天气、温度、距离 等，常用作句子的主语。 -It is Saturday today. 今天是星期六。 -It's two kilometers from school to my home.
从我家到学校有两公里远。
5. it 用作形式主语 5.1 做形式主语代替主语从句
-It is no good learning English without speaking English.
-It's useless trying to argue with Shylock.
6. It 作形式宾语. -We think it important to learn a foreign language.
料，常译为“竟然”。表达惊讶或气愤的语气，如果不是表
达一种语气则不用。 -It is a pity that such a thing ( should ) happen in your class. -It is a pity that he is ill.
4). It happens (seems， looks， appears ) that... 碰巧/看来… 该句型中it是形式主语，that 引导的是主语从句，主句 中的happen ， seem等词是不及物动词。 It happened ( so happened ) that he met his teacher in the
-It is said that he has come to Beijing.
②. It is suggested ( ordered/demanded/insisted/commanded... ) that ... 主句中的过去分词是表示请求，建议，命令等词时，that后 的从句要用虚拟语气（should + 动词原形），should 可以省。
②. It is important ( necessary, strange， natural自然的 )that ...
that 后的从句中要用虚拟语气（should ）+ 动词原形。
-It is important that we (should) learn English well.
2）. It is +v-ed +that 从句 ① It is said (reported， believed，announced....) that ... 据说（据报道，据信, 据报道．．．）
e. g. It’s (about) time that we went / should go to bed.
It’s (about) time for us to go to bed.
2. It + is / was + the first (second …) time + that-clause
导的宾语从句。
-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.
这/那是第…次/天/月/年…
本结构中，It 也可用 this, that 等，其中序数词也可修饰 day, month, year 等名词。 特别注意： 前面是is,从句用现在完成时；前面是was, 则从句用过去完成时。
e. g. It was the second time that I had visited the Great Wall
一过去时刻发生之前的若干时间。
特别注意： 1)主句部分用 was ，before 从句用过去时。 2)主句部分用 will be，则 before 从句用现在时。 e. g. It will be two years before we meet again.
It was a long time before I got to sleep again last
It is the first step that costs.
万事开头难。
It is hard to please all. 众口难调
It takes three generations to make a gentleman.
十年树木,百年树人。 It is easy to open a shop but hard to keep it always open. 创业容易守业难 It is better to give than to take.
1．用作人称代词，代替前面提到的事物或人，在句子中作
主语或宾语。
-Your story is interesting，but I don't like it.
你的故事很有趣，但是我不喜欢。
2．用于疑问句的答语中，代替指示代词(this，that)。
－What's this? 这是什么？
－It's a panda.是只熊猫。 －Whose exercise book is that? 那是谁的练习本？ －It's hers.是她的。 3．当说话者不清楚或没必要知道说话对象的性别时，也 可用it 来表示。 What a beautiful baby! Is it a boy?
5. It is / was + 具体的时间点 + when-clause
本结构是定语从句句型，具体的时间点是先行词，关系
副词 when 引导定语从句。译为“当…的时候是…(时间)” 特别注意： 1)主句部分用 is ，when 从句用现在时。 2)主句部分用 was， when 从句用一般过去时。