it开头的惯用句型

It 句型归纳1．It is ＋adj．(＋for sb．／sth．) ＋to do sth．用于此句型的形容词有：easy，hard，difficult，possible，important，impossible，necessary，good，bad，exciting，interesting，surprising等。

如：It is necessary to change your job．It was very hard for them to walk such a long way inthe snow．2．It is ＋n．(＋for sb．／sth．) ＋to do sth．用于此句型的名词有：pity, shame, pleasure, one’s duty, one’sjob, fun, joy, good manners, bad manners等。

如：It is a pity for you to have missed such a wonderfulplay．It is bad manners for the young to take up the seatsfor the old．3．It is ＋adj．＋of sb．＋to do sth．此句型中的形容词主要描述某人的品德、特征。

能用于该句型的形容词有：kind, nice, wise,silly, polite, impolite, friendly, foolish, clever等。

如：How silly it was of you to give up such a goodchance！It is friendly of the family to try to make me feelat home in their house．4．It is ＋adj．（＋n．）＋doing sth．此句型中的形容词和名词常见的有：no／little use, no／much good,useless等。

It句型归纳It 句型归纳1．It is ＋adj．(＋for sb．／sth．) ＋ to do sth．用于此句型的形容词有：easy，hard，difficult，possible，important，impossible，necessary，good，bad，exciting, interesting，surprising等。

如：It is necessary to change your job．It was very hard for them to walk such a long way in the snow．2．It is ＋n．(＋for sb．／sth．) ＋ to do sth．用于此句型的名词有： pity, shame, pleasure, one's duty, one's job, fun, joy, good manners, bad manners等。

如：It is a pity for you to have missed such a wonderful play．错过如此精彩的表演太可惜了It is bad manners for the young to take up the seats for the old．占据老年人的座位这件事是不好的行为3．It is ＋adj．＋of sb．＋to do sth．此句型中的形容词主要描述某人的品德、特征。

能用于该句型的形容词有：kind, nice, wise, silly, polite, impolite, friendly, foolish, clever 等。

如：How silly it was of you to give up such a good chance！放弃如此好的机会，真是太傻了It is friendly of the family to try to make me feel at home in their house．这一家人太友好了，让我感觉到了自己家似的4． It is ＋adj．（＋n．）＋doing sth．此句型中的形容词和名词常见的有：no／little use, no／much good, useless 等。

It的句型及用法It的基本用法1.it用作人称代词，代替事物，区别one。

That vase is valuable. It's more than 200 years old.那个花瓶很珍贵，它有200多年的历史。

Tom’s mother kept telling him that he should work harder, but it didn’t help.2.it用以代替指示代词this, that.1)--- What's this? --- It's a pen. —这是什么？—是一支钢笔。

2）--- Whose book is that? --- It's Mike's. —那是谁的书？—是迈克的。

3.指示代词it，常用以指人。

1）Go and see who it is. 去看看是谁。

2）--- Who is making such a noise? —是谁发出这样的吵闹声？--- It must be the children. —一定是孩子们。

4.当说话者不清楚或无必要知道说话对象的性别时，也可用it来表示。

1）It's a lovely baby. Is it a boy or a girl?宝宝真可爱，是男孩还是女孩？2)—Who’s there? --It’s me. Who else could it be?由于对方不知道自己的性别，因此用it回答who的提问。

5.it可用来指代团体。

The committee has met and it has rejected the proposal.委员会已开过会，拒绝了这项建议。

6. It常用来表示天气、气候、温度、时间、地点、距离等意义的句子中。

1）It is half past three now by my watch. 我的手表现在是三点半钟。

2）It is six miles to the nearest hospital from here.这里离最近的医院也有六英里。

it的9个常用特殊句型含it的9个常用特殊句型1. It appears/ happens/ seems/ says that…It seems that he is always correct. 他好像总是对的。

It happened that I had no money with me. 碰巧我当时没有带钱。

2. It is said/ reported/ believed/ understood that…It is said that he has joined the Party. 据说他已经入党了。

3. It doesn’t matter…It doesn’t matter what he says. 他说什么都没关系。

4. (It is) no wonder( that) …It’s no wonder he is not hungry; he has been eating sweets all day. 难怪他不饿，他整天在吃糖果。

5.It is a waste of time /money doing sth.It’s a waste of time your talking to him. 你和他谈是浪费时间。

6. It makes no/mush difference…It’s doesn’t make much difference my being there. 我在不在那儿没有什么影响。

7. it takes sb. some time to do sth.It took me nearly an hour to work out the problem. 花了我差不多一个钟才做出那道题.8. It’s one’s turn to do sth.It’s my turn to clean the classroom. 是轮到我打扫教室的了。

9.If it were not for…If it were not for your help, I would still be homeless. 若不是你帮忙，我现在还是无家可归。

It 可指代单数、不可数的物，上文提到的事，时间，金钱，距离，天气。

有时也可以指人、婴儿I: It 作形式主语的句型：1.it + be + adj. ( kind, wise, careless, clever…) + of sb to doIt is wise of him to make such a decision.2.It + be +adj.( easy, safe, common, important, hard….) for sb to doIt is very dangerous for children to play with fire.3. It is useless/ no use/ no good… doingIt is no use arguing with him further.4..It + be+ v-ed (reported, said, believed,….)that 从句…It is said that Tom has been back from abroad.句型中的V-ed 为（表建议suggested, advised, proposed，命令ordered, commanded，要求demanded, requested, insisted）that从句中的谓语should + V原形/be done)It is suggested that the meeting (should) be put off..5.It +be + n.( a pity/ a shame/ a fact, good news….) that …It is good news that Tu Youyou won the Nobel prize.6.It takes sb some time to do sth.It took many people many years to build the Great Wall.II: it 作形式宾语的句型：Sb + ( find/believe/feel/ consider/ think/ make ..) it + adj. / n. to do / thatWe think it our duty to clean our classroom every day.They found it hard that they would finish their work in two weeks.III: IT 引导的时间句型1.It + is +一段时间+ 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。

It 引导的句型结构1． It + be + adj. ( for sb.) to do sth. “〔某人来〕，做某事很⋯〞. It is important for us to learn English well. 我来，学好英很重要。

Exercises璐西来，解道数学很简单。

安娜来，个包太沉了。

2．It + be + adj. + of sb. to do sth. “某人做某事很⋯〞. It was foolish of her to waste money on such clothes.她真蠢，把都花在的衣服上。

Exercises你人真好，帮我个忙。

他真残忍，死了那么多无辜的人。

你真明，能想出么一个好法。

3. It + be + adj./n. + that ⋯“. It is very important that we (should) pay more attention to spoken English.重要的是，我更加重英口。

Exercises沮的是，他并没有通考。

激的是，支球最得了比的利。

4．It + be + n. +. It is no use crying over the spilt milk. 覆水收。

Exercises吸烟没有任何益。

5． It + be + some time + since⋯“从⋯ 起已有多〞 It is tenyears since he had left China他.走开中国已十年了。

6． It +be + (said, reported, believed⋯) + that⋯.It is said that he will leave for Beijing on Tuesday.7． It + be + time + ( that )⋯. 是做什么的候了。

It is time we get up.8. It takes (sb.) some time + ( for sb.) to do sth.It took three weeks for us to finish the work.9.It + be + the first/second⋯+ time + (that)⋯It’s the first time I’ve been here.It was the first time she’d been at a summer school.。

1.It is/was + 被强调部分+ that/who ...该句型是强调句型.被强调部分可所以主语,宾语,表语或状语.强调的主语假如是人,that 可以由 who 换用.假如把这种句型构造划失落后,应当是一个完全无缺的句子.这也是断定强调句型与其它从句的办法.2. It is not until + 被强调部分 + that ...该句型也是强调句型.重要用于强凋时光状语,译成汉语“直到……才……”,可以说是not ... until ... 的强调情势.It was not until she took off her dark glasses that I realized she was a famous film star.= Not until she took off her dark glasses did I realize she was a famous film star.= I didn't realize she was a famous film star until she took off her dark glasses.3. It is clear /obvious/true/possible/cer tain… that …该句型中it 是情势主语,真正的主语是 that 引诱的主语从句,常译为“清晰（显然,真的,确定……）”是主语从句最罕有的一种构造.It is very clear that he's round and tall like a tree. = That he's round and tall like a tree is very clear.4. It is important /necessary/right/strange/natural... that ...+(should) do该句型和上一个同属一个句型.因为主句中的形容词不合,that 后的从句中要用虚拟语气（should + 动词本相）,should 可以省去.5. It is said (reported, learned…) that …该句型中的it 仍是情势主语,真正主语是 that 引诱的主语从句.该构造常译为“据说（据报导,据悉……）”.6. It is suggested ( ordered, required ... ) that ... +(should) do该句型和上一个同属一个句型.主句中的曩昔分词是暗示要求,建议,敕令等词时,that 后的从句要用虚拟语气（should + 动词本相）,should 可以省.常译为“据建议;有敕令……）”.7. It is a pity ( a shame ... ) that ...该句型中,that 后的从句一般用虚拟语气（should + 动词本相）,should 可省去．暗示出乎料想,常译为“竟然”.没有这种意义时,则不必虚拟语气. It is a pity that such a thing ( should ) happen in your class.这种事竟然产生在你们班上,真是圆满！ It is a pity that he is ill. 他生病了,真圆满！8. It is time ( about time , high time ) that ...该句型中that 后的从句应当用虚拟语气,值得留意的是①经常应用曩昔时态暗示虚拟．②有时也用should + 动词本相,should 不克不及省.常译为“是（恰是）……的时侯……”.9. It is the first ( second … ) time that …该句型要和上一个句型差别开来.该句型中的 that 从句不必虚拟语气,而用完成时态.至于用什么完成时态,由主句的谓语动词的时态决议.假如是一般如今时,后面从句用如今完成时态;假如是一般曩昔时,后面从句则用曩昔完成时态.该构造中that 可以省去;it 有时用this 调换,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.10. It is … since ...该句型重要用作处理刹时动词的完成时,又要和暗示一段时光的时光状语连用的问题.主句中是时光作表语,当时态是如今时或完成时,since 引诱的从句平日是一般曩昔时态,并且是刹时动词.假如主句是一般曩昔时,从句则用曩昔完成时.11. It is ... when ...该句型中的 when 引诱的是一个时光状语从句,主句中的it 指时光,表语由具体的时光充当.常译为“当……的时刻,是……”.12. It be ... before ...该句型主句中的 it 指时光, 主句中的时态常是未来一般时或曩昔时两种时态．主句中的表语多是long, not long , 3 days , 2 weeks 等暗示时光段的词或短语.常译为“……之后……”.13. It happens (seems, looks, appears ) that...该句型中it是情势主语,that 引诱的是主语从句,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 street. 恰巧…… It seems that he will be back in a few days. 看来……14. It takes sb. … to do sth.该句型中的不定式是真正的主语,it 是情势主语,句型中的直接宾语是时光.常译为“做……要消费或人……”.15. It is no good (use ) doing sth.该句型中的真正主语是动名词短语,主句中的表语可所以no good , ( not any good ) , no use , ( not any use ).16.Itdoesn'tmatter whether ( if ) ...该句型中whether (if) 引诱的从句是真正主语,该句型常译为“不管（是否）…… 没紧要…….17. It is kind ( of sb. )to do sth.该句型中的不定式短语是真正主语,假如不定式的逻辑主语是由 of 引起,主句中的形容词必须是能暗示逻辑主语特点的形容词.罕有的有: bad, brave, careless, clever, cruel, foolish, good (恶意的), honest, horrible, kind,lazy, modest, naughty, nice (有教化的), 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.It is kind of you to sayso. = You are kind to sayso.18. It is necessary ( for sb. ) to do sth.该句型与上一个同属一个句型.假如不定式的逻辑主语是由for 引起,主句中的形容词平日是暗示重要性,紧急性,频仍程度,难易,安然等情形的形容词.罕有的形容词有：①important, necessary, natural②easy, safe, common, normal, hard, difficult, dangerous, unusual, rare, impossible, pleasant 等.在①中的形容词作表语可以用从句改写,如：It is important for her to come to the party.= It is important that she (should ) come to the party19. It looks ( seems ) as if ...该句型中it 无意义. as if 引诱一个状语从句.常译为,“看起来仿佛……＂假如与事实不相相符,则用虚拟语气．。

it句型归纳和例句it句型是英语语法中的一个重要句型，用于指代前文或上下文中的某事物或概念。

它通常由一个形容词或介词短语修饰，并且可以作为主语、宾语或介词宾语出现。

以下是对it句型的详细解释和相关例句。

1. 作为主语当it作为主语时，它经常用来表示天气、时间、环境或情况等抽象的事物。

在这种情况下，it的作用是引导一个描述句子的主语，使语句更加具体。

例如：It is raining outside.（外面正在下雨。

）It is Friday today.（今天是星期五。

）It is difficult to make a decision.（做出决定很困难。

）2. 作为宾语当it作为宾语时，它通常出现在及物动词、介词短语和形容词后面，表示句子中所描述的事物。

例如：I think it is important to learn English.（我认为学习英语很重要。

）She always wears a hat to protect it from the sun.（她总是戴着帽子来保护自己不被太阳晒伤。

）He found it difficult to concentrate on his work.（他发现很难集中精力工作。

）3. 作为介词宾语当it作为介词宾语时，通常作为一个具体的对象或概念被指代，并出现在介词后面。

例如：I'm thinking about it.（我正在考虑这件事。

）She is good at it.（她很擅长于此。

）I'm not used to it.（我不习惯这种情况。

）此外，it句型还可以与各种被动语态，感官动词和情态动词结合使用，形成更加复杂的句子结构。

例如：It was built in 1920.（它建立于1920年。

）I can't see it clearly.（我看不清楚它。

）It must be done as soon as possible.（这必须尽快完成。