It since it before 句型和练习

It+be+时间+before/since/when/that句型辨析

I. since

1.It is/has been+时间段+since sb did sth某个动作发生持续多久

eg:It is/has been three years since he finished the work.

自从他完成这项工作已经三年了.

2.该句型中若since后跟延续性动词，要翻译成否定含义,即“没做某事已经多久了”.

eg:It has been three years since he worked here.他不在这工作已经三年了.

It has been three years since he smoked.他已经戒烟三年了.

但是：It has been three years since he began to smoke.

他吸烟有三年了。

II.before.

1.It was/will be+时间段+before... 过多长时间将发生某动作或事情；或过了多久发生了某事或动作。

eg:It was three years before he finished the work.他花了三年才完成这项工作.

It will be three years before he finishes the work.他得花三年才能完成这项工作.

2.It won't be/take long before...不久就会…

eg:It won't be long before he finishes the work.他不久就会完成这项工作. III when.

when没有固定与It is…连用的句型.when可表示时间点或时间段，因此从句中短暂性动词或延续性动词均可用.when还可作并列连词，表示突然发生一个动作,等于and at that time.常用句型:

1主语+was/were doing when...

2主语+was/were about to do when...

It+be+时间+before/since/when/that重要考点练习

It +be+时间+before/since/when/that…是高考中每年必考的重要考点，而学生却对这个句型中

几个关联词的选择把握不准，造成失分。我在试题讲解的过程中设计了以下几个小题，让学

生去分析，整理，归纳，效果很好。

1. It was two years ________he realized the truth.

2. It will be two years ________ the economic situation improves.

3. It was two years later ________ he realized the truth.

4. It is /has been two years ________ he lived here.

5. It was midnight ________ he arrived home.

6. It was at midnight ________ he arrived home.

7. It was not until midnight _______ he arrived home.

A. before

B. when

C. since

D. that

「答案与解析」

1、2两个小题都选A. 第一题意为：两年后他才得知真相。第二题意为：经济形式要等两年后才会有所好转。

「归纳」It was/ will be +一段时间+before+句子是高考一个重要考点。意为：多久之后才……

要注意：It will be +一段时间+before+句子，before引导的是一个时间状语从句，所以后面的从句要用一般现在时态表将来。

3. D 此题为强调句型。把It was…that去掉后，句子仍然成立：He realized the truth two years later.

4. C 本句意为：他不住在这儿已经两年了。

「归纳」为since意为自从某时或某事发生以来，故since后从句时，从句的时态应用一般过去时态，而主句应用现在完成时态。如表示某某事发生多久了，则用：It is/ has been+一段时间+since+从句。

「注意」It is/ has been+一段时间+since+从句。在本结构中，从句的谓语动词如为延续性动词时，翻译时要从动作结束时算起。

5. B本句为定语从句，先行词为midnight，在从句中作状语。要注意与第6小题的区别，第6题为强调句型，故答案应为that.

6.D 再看下面两题：

（1）It was the park ________ he first met his wife.

（2）It was in this park ________ he first met his wife.第一题答案应为where，为定语从句；第二题答案为that,为强调句型。

7.D本题亦为强调句型结构：It was not until…that…意为：直到……才……

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it用法及句型归纳

it用法及句型归纳 it为人称代词，主格与宾格同形。该词用法灵活，下面帮助同学们作以归纳。 一、可用来代替指示代词this或that。例如： —What's this/that? 这/那是什么？ —It's a ruler. 这/那是尺子。 二、表示时间、距离、天气、数字等。例如： 1. —What's the time?几点了？ —It's ten to ten. 九点五十。 2. —What's one plus two? 一加二等于几？ —It's three. 等于三。 三、用来代替前面提到的人或物。例如： This is my pen. Give it to me, please. 这是我的钢笔，请把它给我。 四、指心目中或上下文中所指的人或物。例如： 1. —Who's that over there? 那边的人是谁？ —Is it Bill? 是比尔吗？ 2. Miss Gao has a computer. It's new. 高老师有一台电脑，它是新的。 五、指身份不明、性别不详的人或者指照片中的人。例如： —What's the baby in the picture?照片中的那个婴儿是谁？ —It's me. 是我。 六、在电话用语中，可用it来指代对方或者自己。例如： —Hello! Who's it? 喂，你是哪位？ —It's Jim. 我是吉姆。

在初中英语教材中，出现了许多由it引导的固定句式，现归纳如下： 一、It's time for sb. to do sth. / It's time for sth.意为"是(某人)该干……的时间了"、"到……的时候了"。例如： 1. It's time for supper ／to have supper.该吃晚饭了。 2. It's time for me to study.我该学习了。 二、It takes(sb.)some time to do sth.意为"(某人)花……时间做某事"。例如： 1. It takes twenty minutes to go to school by bike. 骑自行车上学要花二十分钟的时间。 2. It took me a week to finish reading the book. 我花了一周时间读完这本书。 三、It is one's turn to do sth.意为"轮到某人做某事了"。例如： It's your turn to be on duty tomorrow. 明天轮到你值日了。 四、It is ／has been ＋时间段＋since ＋一般过去时，意为"自从……以来已过了……(时间)。" 例如： 1. It is / has been four days since I caught a cold. 我感冒已四天了。 2. It is / has been two weeks since we met last. 自从我们上次见面以来已过了两周。 五、It seems ／seemed ＋that从句，意为"看起来好像……"。例如： It seemed that our team was going to win. 我们队看起来好像要赢了。 六、It's＋表语＋to do sth.。例如： It's a good idea to go out for a walk. 出去散步是个好主意。 七、It's ＋adj.＋that从句。例如： It's true that I may fall behind the other students.我真可能落在别的学生后面。 八、It's＋adj.＋of(for)sb.＋to do sth.。对于这个句型究竟用of还是用for，主要取决于前面的形容词。如果形容词是描述不定式行为者的性格、品质等的，如kind，good，nice，clever 等用of；如果形容词仅仅是描述行为的则用for，这类形容词常见的有difficult，easy，hard，important，dangerous等。例如：

常用it作形式主语的句型结构

常用 it 作形式主语的句型结构 ?It + be +形容词+ that-从句 可用于此句型的形容词有 : wonderful, true，good，right，wrong，(un)important ，useless，surprising， clear, unusual, lucky, certain, necessary等。女口： ①It isquite certain that hewill be at the meeting. ②It is surprising that he came late to school this morning. ③It isimportant that we(should) study hard 注意：该句型中的形容词是(un) important, necessary等时，从句应为(should )+动词原形。 ?It + be + -ed 分词 + that-从句 适用该句型的过去分词主要有：said,reported, announced,hoped,thought, told, believed, expected, decided, suggested,known 等。如： ①It ishoped thatonedaytheywill haveenoughanimalsto setthem free ②It is well known that the earth goes around the sun. ③It is suggested that the sports meeting (should ) be put off until next week. 注意：该句型的过去分词是suggested时，从句应为(should )+动词原形。 ?It + be + 名词 + that-从句 适用该句型的名词 (词组) 有：apity, anhonor, agood thing, afact, asurprise, goodnews, one's duty 等。如： ① It isapity (that)you missedthesportsmeetinglastweek. ② It isafactthatEnglish isbeingacceptedasaninternational language. ?It ＋seem／ appear／ happen 的适当形式＋ that 从句。该句型常可以转换成含不定式的简单句。如： ①It seemsthat thereisabig wastepipecomingdown from the town. T There seemsto be a big waste pipe coming down from the town. ②He appearedto becalm,but insidehisheartwasbeatingwildly with fear. t It appearedthathewascalm,butinsidehisheartwasbeatingwildly with fear. ?It does n't matter ( It 'no won der; It does n 'make much differe nee 等) ＋ when/ where/ which/ whether 等从句。如： ①Does it matterif hecan'tfinish thejob ontime? ②Theyareallclassmates. It isnowonder they should help eachother with their studies. ?It + be+ adj./ n. (for sb./ ofsb.)+ todosth. 该句型中的形容词通常是表示事物的特点或特征的如 difficult , hard, easy, impossible, necessary, important 等,此时用 fo r ；或表示人的性格特征或特点的如nice, good, bad, kind, silly, foolish, wise, clever, careless, rude, brave, cruel, careful, grateful等，这时要用 of。如： ① It is foolish of you to give up such a good chance. ② It is necessary for college students to master at least a foreign language It 作形式主语常见句型 动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用 it 作形式主语，放到句首，常见句型有：

it句型综合练习题

1.It was about 600 years ago______the first clock with a face and an hour hand was made. 2.It was not until she took off her dark glasses _____ __ I realized she was a famous film star. 3.It is necessary that he ________(remember) these word s. 4.______ is reported that another man-made satellite has been put into orbit . 5.Another man-made satellite is reported __________(put) into orbit. 6._______is reported, another man-made satellite has been put into orbit. 7._____is reported is that another man-made satellite has been put into orbit. 8.It is suggested that the meeting________(put) off. 9.It is a pity that such an important essay _______(have) so serious a mistake. 10.It was ordered that we _______(arrive) there in two hours. 11.It is high time that tough measures _______(take) to solve the problem. 12.That was the last time that I _______(see) her. 13.It is important that we ________( learn) English w ell. 14.It is typical ____ him to tell lies when he does something wrong. 15.It __________ 5 years since his father died. 16.It was October 1st _______ China was founded. 17.It was 3 days _______ he went to Beijing. 18.It __________(碰巧)that he encountered an old friend in the street. 19.It took thousands of people many years ________(b uild)the Great Wall. 20.It is no good _______(learn) English without spea king English. 21.It will be not long _______ he finishes his job . 22.It seemed as if he ______(be) mad. 23.____is a hard job for the police to keep order in an important football match. 24.____used to be thought that the earth was square . 25.We had to be patient because it____some time ___ _we got the full results.

复习专题 形容词专项练习题

复习专题形容词专项练习题 一、初中英语形容词 1．— Paul, do you prefer weekdays or weekends? — Weekdays, of course. I'm on weekends. A. busy B. much busier C. more busier D. the busiest 【答案】 B 【解析】【分析】句意：——Paul，你更喜欢周末还是工作日？——工作日。当然，我在周末更繁忙。A.繁忙的。原级；B.更繁忙，比较级；C.more不修饰比较级；D.最繁忙的，最高级。根据do you prefer weekdays or weekends?可知是工作日和周末比较，所以用比较级，故选B。 【点评】考查比较级，注意平时识记，理解句意。 2．Who is one, Tom or Jack? A. the taller B. the tall C. the tallest D. tall 【答案】A 【解析】【分析】句意：汤姆和杰克，谁更高？A.the taller更高的，比较级；.the tall高的；C.the tallest最高，最高级形式；D.tall高，原形。在汤姆和杰克两人之间作比较，用比较级形式。故选A。 【点评】本题考查形容词比较级，两者之间做比较就用比较级。 3．Eating dumplings at the Spring Festival is ________ in China. A. patient B. lucky C. possible D. traditional 【答案】 D 【解析】【分析】句意：在中国，春节吃饺子是传统。A. patient病人，有耐心的；B. lucky 幸运的；C. possible可能的；D. traditional传统的；根据语境及意义，故选D。 【点评】对于大多数学生而言，根据语境选择适当的词并不困难，而关键是词汇量的不足。Traditional,谐音记忆：传得深远。 4．Though she is eighty years old, she is in good health. A. unhealthy B. ill C. healthy D. strong 【答案】 C 【解析】【分析】句意：虽然她八十岁了，但是她身体健康。A.unhealthy不健康的；B.ill 生病的；C.healthy健康的；D.strong强壮的。In good health是健康的意思，故选C。 【点评】本题考查形容词词义辨析。以及unhealthy，ill，healthy，healthy四个词的词义和用法。 5．—You have made such a great progress on your English.

-it的用法及强调句型(精心整理)

it的用法及强调句型 it的用法 一、it作指示代词【完成句子】用one，ones，it，that，those填空 (1) — I can't find my watch. —You haven't found ______？If you want to buy a new ______，I suggest you buy ______ made in China. (2) We've got a big cup and two small ______. (3) The weight of an elephant is much greater than ______ of a tiger. (4) The books on the first shelf are easier than ______ on the second shelf. (5) The boy told his story and ______ of the girl upstairs. 【答案】(1) it; one; one (2) ones(3) that (4) those / the ones (5) that / the one 【结论1】 ①指代上文提过的事物时，it指的是同名同物，相当于the＋名词； ②one指的是同名异物，表示单数可数名词相当于a ＋名词；a / an＋形容词＋one等于a / an＋形容词＋名词；复数形式用ones； ③that后面常有后置定语，有特指意义，代替不可数名词或单数可数名词，相当于the＋ 名词； ④复数名词用those，相当于the ones。 【例句观察】— Someone is knocking at the door. Who is it? — It must be Leo. He said he'd come to see me. 【结论2】it指代人时，常指小孩或身份不明的人。 【例句观察】It's too quiet in the room. Everyone just keeps silent. 【结论2】it可用以指代环境或情况。 (6)— What time is it now? — It's half past seven. (7)— It is spring now and it's warm these days. 【结论3】it可用以指代时间、季节、天气或距离。 【注意】it指代时间时，有如下一些句型： (1) It is time for sth. (for sb.)to do sth. / that－从句(should do / did, 必须用虚拟语气) 例：① It's time for lunch. ② It's time for us to clean the house. ③ It's time that we should clean the house. ＝It's time that we cleaned the house. (2) It is / has been ＋some time ＋since－从句(从句用一般过去时) It is 10 years since I graduated from college. (3) It / This/That is the first / second time that－从句(必须使用现在完成时)这是某人 第……次做了某事。 It / This/That was the first / second time that－从句(必须使用过去完成时) 例：①It is the second time that she has visited the Great Wall. ②This was the first time that I had come late to school. (4) It was ＋时间点＋when －从句 例：It was evening when we got home. ＝It was evening in which we got home. (5) It was / will be ＋some time ＋before －从句 例：①过了5年他们才从北大毕业。 It was five years before they finally graduated from Beijing University. ②不久，我们就要从我们学校毕业了。 It won't be long before we graduate from our school. 二、it作形式主语 1.代替主语从句 ①It is clear ( obvious，true，possible certain....) that ..... “清楚（显然，真的，肯定．．．）” ②. It is important ( necessary，right，strange，natural...) that ... that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去，建议记住该句型中的形容词。 It is important that we (should) learn English well.