it用法1

it和is的用法区别一、理解it和is的基本概念在英语中，it和is都是常见的单词。

它们在不同的语境中有着不同的用法和意义。

为了正确地使用它们，让我们首先了解一下它们的基本概念。

1. it：it是一个代词，用来指代非人类事物或抽象概念。

当我们无法确定性别或没有特定主语时，就可以使用it来引用某个事物。

2. is：is是be动词（be verb）的第三人称单数形式。

它被用来描述第三人称单数主语（He、She、It）所具有的状态、特征或性质等。

二、it和is在句子中的不同作用1. it作为主语：在句子中，it通常作为主语出现，并指代前面提到过或将要提到的事物。

例如：- It is a beautiful day. （今天天气很好）- It is important to study hard. （努力学习很重要）2. is作为be动词：is通常与他/她/它相关联，并与其他词汇一起构成谓语部分。

例如：- She is an excellent athlete. （她是一名优秀的运动员）- The dog is sleeping under the tree. （狗正在树下睡觉）三、it和is在不同语境下的用法区别1. 时间和天气的描述：在表示时间和天气的描述中，it常作为虚主语，用来指代具体的时间或天气状况。

例如：- It is 3 o'clock. （现在是三点钟）- It is raining outside. （外面正在下雨）2. 表达感受或情感状态：当我们表达个人感受或情感状态时，it也常被使用。

例如：- I find it difficult to understand this concept. （我发现这个概念很难理解）- It makes me happy to see my friends succeed. （看到我的朋友们成功使我很开心）3. 强调特定主语（刻板用法）：有时候，我们使用it来建立一个结构，以便更好地强调动词或补语。

ones和it的用法一、ones的用法1.1 作主语在句子中，ones可以用作名词的代词，表示前面提到的事物或人。

它的单数形式是one。

例如：- I bought a new car and an old one.（我买了一辆新车和一辆旧车。

）- She liked these books, but she didn't like those ones.（她喜欢这些书，但不喜欢那些。

）1.2 作定语ones也可以用作名词的定语，修饰后面的名词，起到相同种类或类型的事物和人的指代作用。

例如：- Have you seen my keys? The ones with the red keychain are mine.（你看见我的钥匙了吗？带红色钥匙链的那些是我的。

）- I need to buy some pens, but I prefer the gel ones.（我需要买些钢笔，但我更喜欢凝胶墨水笔。

）1.3 作宾语在句子中，ones可以作及物动词或介词后面的宾语。

例如：- Please bring me a glass of water. Can you also bring me a bottle of juice? The small ones will do.（请给我拿杯水。

还能给我拿瓶果汁吗？小瓶的就行。

）- The store sells different sizes of shoes. You can try on different ones to see which fits best.（商店出售不同尺码的鞋子。

你可以试试不同的，看哪个最合适。

）二、it的用法2.1 作人称代词it作为人称代词，常用于指示不具体对象或动物。

例如：- It is raining heavily outside.（外面正在下大雨。

）- It's already late, we should go home.（已经很晚了，我们应该回家了。

入舵市安恙阳光实验学校高考英语一轮复习讲解：it的用法【知识要点】It的用法（一）作人称代词1、it代替前面（或后面）的单数名词或分句等所表示的事物。

e.g. You cannot eat your cake but have it.（it代替前面的cake）Although we cannot see it, there is air all around us. （it 代替后面的air）They say he has left town, but I don’t believe it. （it代替前面They…town分句中的情况）2、代替有生命但不能或不必分阴阳性的东西（包括婴儿）。

e.g. Yesterday we saw a big tree. It was fully twenty metres high. （it代替前面的tree）The baby cried because it was hungry. （it代替前面的baby）3、在某些习惯说法中，可以代替人。

e.g. ---- Someone is knocking at the door, Peter.---- Who is it?---- It’s me.---- Who are singing? ---- It is the children.---- The light is still on in the lab. It must be the third-year students doing the experiment.4、it与one的区别：这两个词都可以代表前面说过的名词，但it用于同名同物的场合；one则用于同名异物的场合。

e.g. ---- Do you still have the bicycle? ---- No, I have sold it.---- Is this knife yours? ---- No. It is Xiao Zhang’s. Mine is the one on the desk.5、it与that的区别：两词都可代替某一特定名词，但that指同一类，并非同一个。

" It" 做形式宾语用法总结当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾，构成“动词＋it＋宾语补足语＋不定式（动名词或从句）”结构，也可称作“6123结构”。

此时it仍只起先行引导作用，本身无词义。

它可以代替三种形式：不定式、动名词和宾语从句。

it作形式宾语时，需具备两个条件：①真正的宾语是不定式、动名词或从句; ②有宾语补足语，具备了这两个条件，形式宾语it一定要用。

⒈ it代替不定式短语think/ find/ feel/ consider/ make/ regard…+ it +形容词/名词+ 不定式短语如：①I find it pleasant to work with him.(it 作形式宾语，代替不定式短语to work with him)②They felt it difficult to finish the work in such a short time.（it 作形式宾语，代替不定式短语to finish the work in such a short time）③She thinks it her duty to help us.（it 作形式宾语，代替不定式短语to help us）④I think it my honor to be invited to speak here.（it 作形式宾语，代替不定式短语to be invited to speak here）⑤Tom didn’t find it difficult to write letters i n Chinese.（it 作形式宾语，代替不定式短语to write letters in Chinese）⑥All these noises made it impossible for me to go on with the work.（it 作形式宾语，代替不定式短语to go on with the work）⒉ it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些)如：①The professor considers it no good reading without understanding.②Do you consider it any good trying again?③He found it useless( no use) arguing with him.④He thought it absolutely senseless attempting the impossible.⑤I don’t think it worthwhile going to such a place.⒊ it代替宾语从句：如：①We all thought it a pity that the conference should have been cancelled.②I took it for granted that they were not coming.③I’ll see to it that everything is ready in time.“it”的特殊用法常出现在以下几种结构中。

It的用法It的用法分为四类：人称代词it，形式主语/形式宾语it，强调句型it，固定结构it一、人称代词it：1. 指代前面提到的具体事物、动物，也可指婴儿或未知的人。

1) I was disappointed with the film , I had expected _______ to be much better.A. thatB. thisC. oneD. it2）They got a baby and _____was very lovely.2. 指代天气，时间，距离等抽象事物。

It’s cold today. What time is it?It’s far away from here. It’s quiet here.1) It’s high time that …常用虚拟语气,常用过去式表虚拟有时也用should(不省)+V原It’s high time that children ________________________.（上床睡觉）2) It’s the first/second/last…time(that)…从句用现在完成时态。

如果主句be为was，从句则用过去完成时态It’s the first time I （visit）here.This was the first time that I (visit) here.3）It is (has been)+时间段+since…从句通常是一般过去时如果主句be为was，则从句用过去完成时It is /has been 5 years since his father died.It is /has been 5 years since he lived here. 其意义为：_____________。

4) It + be + 时间段 + before…常译为___________________________。

he she it的用法口诀一、名词关系的主客体表示法在英语语法中，根据名词或代词的性别和数量，我们需要正确选择动词的主谓一致形式。

而对于第三人称单数的代词 "he"、"she"、"it" 的用法，特别是在使用动词时，往往容易引起困惑。

下面将为您详细介绍关于这些代词的用法口诀。

二、他/她/它：性别与意义1. "He" 用来指代男性生物或具备男性特质的异性；2. "She" 用来指代女性生物或具备女性特质的异性；3. "It" 用来指代无生命和某些缺乏明显特征（如小动物）的事物。

三、主语用法规则在句子中，作为主语使用 "he"、“she” 和“it” 的规则如下：1. 当主语是一个男性人士时，我们使用 "he"。

例：He is a doctor.(他是一名医生。

)2. 当主语是一个女性人士时，我们使用 "she"。

例：She is a teacher.(她是一位教师。

)四、客体用法规则在句子中作为客体出现时，“he”、「“she”」和「“it”」的用法规则如下：1. 作为动词的直接宾语时，使用「him」（指代男性），「her」（指代女性）和「it」（指代无生命事物）。

例：I saw him yesterday.(昨天我见到了他。

)2. 当作介词的宾语时，使用「him」、「her」和「it」。

例：I gave the book to her at the library.(我在图书馆给她了那本书。

)3. 在形容词或不及物动词后面作表语时，采用「he is...」「she is...」「it is...」的形式。

例：He is tall.(他很高。

)She is beautiful.(她很漂亮。

)五、情态动词与“he/she/it”的搭配在情态动词和助动词短语中，“he/she/it”的搭配也需要特别注意：1. 对于一般现在时态句子中，我们需要使用合适的第三人称单数形式。

高三一轮语法回顾与训练---It的用法和there be结构1.代词it常用来指代前文提到的事或物，还用在各种特殊句型中。

there be表示“存在”，可用在不同时态和句型中。

2.考点归纳一、it用法1. it用作形式主语（1）It + be + adj. + 主语从句It is clear（obvious / true / possible / certain…）+ that / whether…从句…It is essential（important / necessary / right / strange / natural…）+ that从句…（should + 动词原形）It is uncertain whether he can come to Jenny’s birthday party or not.It is important that we should learn English well.（2）It + be + 名词词组+ 主语从句It’s a pity that you missed the exciting football match.（3）It + 不及物动词（seem / appear / happen / turn out…等）+ 主语从句（看来/ 似乎/ 碰巧/ 证明是）It seemed that he didn’t tell the truth.It happened that I was out when he called.（4）It’s + adj. + for / of + sb. + to do sth特别注意：如何选择介词for 或of？如果该句型中的形容词是用来说明“某人”的性格或品质（如kind, good, nice, wise, stupid, clever, foolish, silly, impolite, selfish, considerate ...）时，介词用of（“某人”和这些形容词可以构成主系表结构），其它情况介词用for。

it的句型汇总（一）It 既是代词，也是引导词（语法亦叫功能词），是最简单也是用法最复杂的一个词。

作为代词，it主要用于指代前文提及的某种事物、某种情况，甚至还可以指性别不明确的人；也可以指时间、日期、地点、距离、天气、温度、环境等。

作为引导词，it可以用作形式主语、形式宾语以及引导强调句型等。

关于it作为代词的用法，大家都已经十分熟悉。

本文不再赘述，而主要对it作为功能词的用法，做一归纳和总结。

1. It is necessary (for sb.) to do sth. 句式在该句式中，it是形式主语，动词不定式是真正主语，不定式的逻辑主语用for sb.。

句式中的形容词通常表示不定式的重要性、必要性、难易程度等基本情况。

如important, necessary, natural, easy, safe, common, normal, hard, difficult, dangerous, unusual, rare, impossible, pleasant等。

例如：It is very important for us to take part in physical training out of class.It is too difficult for a three-year-old child to answer such a question.不可以说：*We are very important to take part in physical training out of class.*A three-year-old child is too difficult to answer such a question.2. It is kind (of sb.) to do sth. 句式该句式与上述句式十分相似，形容词往往表示不定式逻辑主语的品质或特征属性，所以用of sb., 不用for sb. 常见的这类形容词有：good, bad, brave, careless, clever, cruel, foolish, honest, horrible, kind, lazy, modest, naughty, nice, polite, rude, silly, stupid, wise, wrong,等。

【本讲教育信息】一、教学内容A. it isB. it is thatC. is it thatD. is that5）—_____ that he managed to get the information?—Oh, a friend of his helped him.A. Where was itB. What was itC. How was itD. Why was it4、强调句型的主谓一致It is I who\that ______ to blame.5、强调句型的变形：It seemed to be + 被强调部分+ that + 其它成分It might be + 被强调部分+ that + 其它成分It must have been + 被强调部分+that + 其它成分It seemed to be at noon that he got back.It must have been his brother that you saw.It might be his father that he is thankful for.6、强调句型与名词性从句结合1）I’ve already forgotten _____ you put the dictionary.A. that it was thereB. where was it that2) It _______ we had stayed together for a couple of weeks _____ I found we had a lot in common.A. was until, whenB. was until, thatC. wasn’t until, whenD. wasn’t until, that（二）It作形式主语和宾语一）主语从句1. It + be + adj. +that\whether…+从句It is important that we (should) learn English well.It was not clear to me why he behaved like that.2. It + be + n. +that\ whether…+从句It’s a wonder that he is still alive.It was a puzzle how life began.3. It + be + p.p +that\ whether…+从句It is reported that the enemy have crossed the border.It is not yet settled whether I am going to America.4. It +v. +that\ whether…+从句It happened that she wasn’t in that day.It never occurred to me that perhaps she was lying.It seemed that you are right.It struck me that we ought to make a new plan.It doesn’t matter much where we live.It makes no difference whether we go by train or by boat.It remained to be seen whether they will accept it.二）形式主语1. It’s ＋adj./n.＋(for sb.) ＋to doIt’s very important for us to learn a foreign language well.2. It’s ＋adj. ＋of sb. ＋to doIt’s very kind of you to help me with the big box.3. It takes sb. +时间段＋to do4. It’s no use arguing with him about it.It’s much good writing to him now.It’s a waste of time your talking to him.三）形式宾语find/make/feel/think it +adj./n. +to do【高考真题】1) _____ in the regulations that you should not tell other people that pass-word of your e-mail account.A. What is requiredB. What requiresC. It is requiredD. It requires2) The chairman thought ____ necessary to invite Professor Smith to speak at the meeting.A. thatB. itC. thisD. him3) As the busiest woman in Norton, she made ____ her duty to look after all the other people’s affairs in that town.A. thisB. thatC. oneD. it4) He didn’t made ____ clear when and. where the meeting would be held.A. thisB. thatC. itD. these（三）It的时间状语从句1. It + be + 时间点+ when +…It was September ____ we began our senior high school. 比较：It was in September_____ we began our senior high school.It was midnight _____ we got everything ready. 比较：It was at midnight _____ we got everything ready.2. It + be + 时间段+ before +…It was not long before we met again.It will be two years before we meet again.t help it. = It can3. 置于动词、介词之后，作形式上的宾语。