经典全面中考定语从句讲解与练习含答案 15页

优才教育 定语从句（一）关系代词The Attributive Clause---- Relative Pronoun 一、 定义：在复合句中修饰名词或代词的从句叫做定语从句。被定语从句修饰的名词或代词叫做先行词。引导定语从句的词叫做关系词。定语从句必须放在先行词之后，对其先行词起限定作用。‎ 二、关系词 定语从句的关系词分为关系代词和关系副词。关系代词在定语从句中可作主语、宾语、表语、定语等。关系副词在定语从句中作状语。‎ 三、关系代词 代替人 代替物 代替人或物 主语 who which that 宾语 whom/who which that 定语 whose whose ‎1. that的用法 that既可以指人，也可以指物，指人时可与who, whom互换，指物时有时可与which互换。在句中可以作主语、宾语、表语。‎ ‎①His father works in a factory that/which makes car. 他父亲在一家汽车制造厂工作。‎ 作主语，指物 ‎②The lady (that/who/whom) I want to visit taught me French at that time.我要去 拜访的那位女士那个时候教我法语。‎ 作宾语，指人 ‎③The school that/which we visited yesterday is a good one.我们昨天参观的学校是所好学校。‎ 作宾语，指物 ‎2. which的用法 which一般指物，在定语从句中作主语、宾语，作宾语时可以省略（放在介词后除外）。Which也可以指代这个主句。‎ ‎①A dictionary is a book which/that gives the meaning of words. 字典就是讲解单词意思的书 作主语 ‎②Here is the book (which/that) the teacher mentioned yesterday. 这就是老师昨天说得那本书 作宾语 ‎③The sun heats the sun, which makes it possible for man to live.太阳给地球热量，这使得人类能够生存。‎ ‎ 代替整个主句 15‎ 优才教育 ‎3. who/whom的用法 Whom在从句中用作宾语，现在仅用于正式文体。用who代替whom在从句中做宾语，主语用于口语。如：‎ ‎①The gentleman whom Rose encountered addressed her with courtesy.‎ 罗斯遇到的那位先生很有礼貌地和她讲话。（正式文体）‎ ‎②The man who I saw is called Smith. 我见到的那个人名叫史密斯。（非正式文体）‎ 在口语中，who, whom, which在从句中做动词宾语时，常常省去。如：‎ ‎①I don’t like people who talk much but do little. 我不喜欢光说不练的人。‎ ‎ ‎ 作主语 ‎②Do you know the young man (whom) we met at the gate?你认识我们在门口遇见的那个年轻人吗？‎ 作宾语 ‎③He didn’t become the person who his father wanted him to be.他没有成为他父亲希望的那种人。‎ 作表语 注意：whom在从句中作介词的宾语，且介词提到whom前面时，不能用who代替。‎ I have many friends to whom I will send postcards. 我有许多需要寄贺卡的朋友。‎ ‎4. whose的用法 whose在从句中作定语，可以指人也可以指物。‎ ‎①The girl whose father is a teacher studies very hard. 这个女孩学习很努力，她的父亲是教师。‎ 指人 ‎②We have English classes in the classroom whose door is broken.我们在那个门坏了的教室上英语课。‎ 指物 四、限制性定语从句及非限制性定语从句 根据定语从句与先行词的关系，定语从句可分为限制性定语从句及非限制性定语从句。限制性定语从句紧跟先行词，主句与从句不用逗号分开，从句不可省去，非限制性定语从句主句与从句之间有逗号分开，起补充说明作用，如省去，意思仍完整。 ‎ 1. 限制性定语从句：主句和从句不隔开，从句不能省略，否则就会失掉意义不能成立。如：①He is reading a book which is too difficult for him.‎ ‎②Here is the boy who damaged the glass.‎ 15‎ 优才教育 1. 非限制性定语从句：主句和从句用逗号隔开，从句对修饰的部分起到进一步说明的作用，拿掉后其它部分的语意仍保持完整。如： ‎ ‎①The book is written by Guo Jinming, who is only 19 years old. ‎ ‎②Bob’s father, who was an engineer, spent 4 years in Egypt. ‎ ‎③Shanghai, which is developing fast, has become one of world’s trade centers.‎ ‎【注意】：‎ 非限制性定语从句不能用that引导 ‎ ‎①She is very fond of French, which indeed she speaks quite well. ‎ which还可以用来指代上文中的一件事情 ‎ ‎①Their house is washed away by the floods, which made them very sad. ‎ ‎②He lost his job finally, which was exactly what we wanted.  ‎ 五、关系代词的省略 引导限制性宾语从句的关系代词在作宾语、表语时可以省略，但作主语和引导非限制性定语从句时，关系代词不可省略。‎ ‎①I have been the city twice（which/that）you just visited.你刚参观完的那座城市，我去过两次。‎ ‎②After 10 years, John is not the naughty boy(who/that) he used to be.10年后，约翰已经不是当年那个淘气的男孩了。‎ 练一练 A. 用符号标出下列句子的主句、定语从句、先行词和关系词：‎ 主句：______ 定语从句：（） 先行词：先行词关系词：that 例：This is the book (that I have been looking for).‎ 1. ‎ The movie that we saw last night is very exciting.‎ 2. ‎ Have you bought the book which we talked about?‎ 3. ‎ I still remember the day which we spent together last week.‎ 4. ‎ He still lives in the house whose windows face south.‎ 5. ‎ The boy whose father is a policeman speaks English most fluently in our class.‎ 6. ‎ The girl who you met was John’s sister. ‎ B．填入适当的关系词 1. I have a friend ________ likes listening to classical music. ‎ 2. Yesterday Emmy was wearing the new dress ________ I gave her. ‎ 3. The man ________ leg was broken in a match was a football player. ‎ 15‎ 优才教育 1. Kevin is reading a book ________ is too difficult for him. ‎ 2. The family ________ I’m staying with lives in the country. ‎ 3. I know the student ________ book was published. ‎ 4. Betty, ________ has never been abroad, is studying English hard. ‎ 5. My parents live in a house ________ is more than 100 years old. ‎ 6. The boy with ________ John spoke is my brother. ‎ 7. Shanghai is the city ________ I visited last summer. ‎ ‎1 who 2 which/that / 3 whose 4 which/that 5 that/省略 ‎6 whose 7 who 8 which / that 9 whom 10 that /which /省略 C．单项选择 1. Who is the man ________ is reading a book over there? （杭州）‎ ‎ A. that B. whose C. which D. what ‎ 2. The man ________ is talking with my teacher is Tom’s father. （四川眉山）‎ ‎ A. who B.whom C. whose D. which ‎ 3. Li Mei is the student ________ handwriting is the best in our class.（贵州铜仁）‎ ‎ A. whose B. whom C. who D.that ‎ 4. The people ________ helped us build our hometown are from Beijing.（四川德阳）‎ ‎ A. which B. whom C. who ‎ 5. There will be a stamp show in the museum ________ we visited last week. （嘉兴、舟山）‎ ‎ A. who B. when C. which D.what ‎ 6. Peter likes music ________ is very loud and energetic. （山东临沂）‎ ‎ A. that B. who C. whom D. / ‎ 7. One of the most interesting places in Yangzhou ________ are often visited by foreigners is the West Slender Lake. （扬州）‎ ‎ A. what B. who C. that D. / ‎ 8. ‎—Who is your new head teacher this semester?（黄冈）‎ ‎—The woman ________ is wearing a red skirt. ‎ A. whom B. who C. whose D. which ‎ 9. ‎—Do you know the man ________ is reading the book over there? （湖北襄阳）‎ ‎—Yes, he’s Mr. Green, our PE teacher. ‎ ‎ A. which B. what C. whom D. who ‎ 10. I’ve become good friends with several of the students in my school ________ I met in the English speech contest last year. （湖北十堰）‎ ‎ A. who B. where C. when D. which ‎ 11. ‎—What are you looking for? （长沙）‎ 15‎ 优才教育 ‎—I’m looking for the book ________ you lent me yesterday. ‎ ‎ A. that B. who C. whose ‎ 1. Tony, tell me the result of the discussion ________ you had with your dad yesterday. （河南）‎ ‎ A. what B. which C. when D. who ‎ ‎1---5 AAACC 6---10 ACBDA 11---12 AB 15‎ 优才教育 定语从句（二）关系副词The Attributive Clause--- Relative Adverb 一、关系副词 关系副词在句子中作状语。常用的关系副词有where, when, why, that等。‎ 关系副词 先行词 在从句中充当的成分 when 表示时间的名词 时间状语 where 表示地点的名词 地点状语 why reason 原因状语 二、关系副词的用法 Ø when的用法 when指时间，在从句中作时间状语，它的先行词通常为time, day, morning, night, week, year等。‎ ‎①I’ll never forget the day when I first came to Beijing. 我永远也不会忘记来北京的第一天。‎ ‎②He came at a time when we needed help. 他在我们需要帮助的时候来了。‎ Ø where的用法 where指地点，在从句中作地点状语。它的先行词通常有place, factory, street, house, room, city, town, country, village, school等。‎ ‎①This is the house where I was born. 这就是我出生的房子。‎ ‎②The factory where his father works is in the east of the city. 他父亲工作的那家工厂在城市的东边。‎ Ø why的用法 why 指原因，在从句中作原因状语，其先行词通常是reason。‎ ‎①Nobody knows the reason why he is often late for school. 没有人知道他为什么总是迟到。‎ ‎②Who can tell me the reason why the train was delayed? 谁能告诉我火车延误的原因？‎ 引导定语从句的关系副词代替与其相应的先行词，并且在从句中分别做时间、地点和原因状语，关系副词在意义上常常相当于一个“介词+which”结构。如：‎ ‎①I shall never forget the day when we first met. 我永远忘不了我们第一次相遇的那一天。‎ ‎= I shall never forget the day on which we first met.‎ ‎②Beijing is the place where I was born. 北京是我出生的地方。‎ ‎= Beijing is the place in which I was born.‎ ‎③Is this the reason for which he refused our offer?　这就是他拒绝我们的理由吗？‎ ‎= Is this the reason why he refused our offer?‎ 15‎ 优才教育 由此可见：‎ when = on (in, at, during…) + which where = in (at, on…) + which why = for which 三、“介词+关系代词”引导的定语从句 Ø 介词+which ‎ 此结构相当于一个关系副词，介词的选用由which所代替的名词在构成介词短语时与介词的固定搭配所决定。‎ ‎①We don’t know the time when/at which the meeting will begin. ‎ 我们不知道会议开始的时间。（at the time → at which= when）‎ ‎②This is the house where/in which he was born. ‎ 这是他出生的那间房子。（in the house → in which=where）‎ Ø 介词+whom ‎ 当关系代词代替的是人而不是物，并在定语从句中作介词宾语时，要用whom。‎ ‎①The man with whom you talked just now is our manager. ‎ ‎=The man who you talked with just now is our manager. ‎ 你刚才与他谈话的那个人就是我们的经理。‎ ‎②This is the hero of whom we are proud. ‎ ‎= This is the hero who/whom/that we are proud of. 这就是我们引以为荣的英雄。‎ Ø 名词/代词+介词+关系代词 ‎①I bought a dozen eggs, half of which were broken when I got home. ‎ 我买了一打鸡蛋，当我到家时，碎了一半。‎ 练一练 A．填入适当的关系词 1. Shanghai is the place ________ I went last summer.‎ 2. The reason ________ Peter is so happy is that he passed the driving test.‎ 3. I remember the day ________ my dog died. ‎ 4. I will go back to the city ________ I grow up.‎ 5. Sep. 1st is the day ________ the school starts.‎ 6. The factory ________ my father works makes telephones.‎ 7. This is the room ________ she does her homework every day.‎ 8. We went to visit the house ________ the great writer was born.‎ 9. I will never forget the day ________ we first met.‎ 15‎ 优才教育 1. Please tell me the reason _______ you were late again.‎ Key: ‎ ‎1. where 2. why 3 .when/on which 4. where 5 .when ‎6 .where 7 .where 8 .where 9 .when 10. why ‎ B. 分别用关系副词、介词+关系代词填空 1. The library __________ __________ I often borrow books is not far from here.‎ The library __________ I often borrow books is not far from here. ‎ 2. Is this the bus __________ __________ you left your umbrella?‎ Is this the bus __________ you left your umbrella?‎ 3. October 1, 1949 was the day __________ __________ the People’s Republic of China was founded. ‎ October 1, 1949 was the day __________ the People’s Republic of China was founded.‎ 4. Children are looking forward to the holidays __________ __________ they can play together. ‎ Children are looking forward to the holidays __________ they can play together.‎ 5. Who knows the reason __________ __________ the girl is crying?‎ Who knows the reason __________ the girl is crying?‎ 6. The reason __________ __________ the flowers are dead is too much water. ‎ The reason __________ the flowers are dead is too much water.‎ Key: ‎ ‎1. from which; where 2. on which; where 3. on which; when ‎ ‎4. in which; when 5. for which; why 6. for which; why ‎ C．单项选择 1. After living in Paris for fifty years, he returned to the small town ______ he grew up as a child.‎ ‎ A. which B. where C. that D. when 2. In the dark street, there wasn’t a single person ________ she could turn for help.‎ ‎ A. that B. who C. from whom D. to whom ‎ 3. Is this the plane ________ he came to New York? ‎ ‎ A. which B. by which C. that D. in which ‎ 4. This is the school ________ I studied three years ago. ‎ ‎ A. where B. when C. that D. which ‎ 5. ‎—What do you usually do in your leisure time? ‎ ‎—I enjoy reading in the library ________ I lose myself in a world of good books.‎ ‎ A. which B. that C. where ‎ 6. I can’t forget the time ________ the earthquake happened in Yushu. ‎ 15‎ 优才教育 ‎ A. when B. which C. that D. where ‎ 1. I still remember the park ________ we first met. ‎ ‎ A. that B. which C. where D. when ‎ 8. The old man has two sons, ________ are lawyers. ‎ ‎ A. both of them B. both of who C. both of whom D. both of they ‎ 9. He is a man of great knowledge, ________ much can be learned.  ‎ ‎ A. in whom B. about whom C. from whom D. of whom ‎ 10. He has left Beijing, ________ a meeting is to be held. ‎ ‎ A. when B. where C. as D. which ‎ Key: 1---5 BDDAC 6---10 ACCCB D. 自我挑战 ‎1. I’ll give you my friend’s home address, ________ I can be reached most evenings. （北京）‎ ‎ A. which B. when C. whom D. where ‎2. All the neighbor admire this family, _____ the parents are treating their child like a friend. （安徽）‎ ‎ A. why B. where C. which D. that ‎ ‎3. Life is like a long race ________ we compete with others to go beyond ourselves. （重庆）‎ ‎ A. why B. what C. that D. where ‎4. —What do you think of teaching?‎ ‎ —I find it fun and challenging. It is a job ________ you are doing something serious but interesting. （北京）‎ ‎ A. where B. which C. when D. that ‎ ‎5. Sales director is a position____ communication ability is just as important as sales ability. （重庆）‎ ‎ A. which B. that C. when D. where ‎6. We live in an age _______ more information is available with great ease than ever before. （浙江）‎ ‎ A. why B. when C. to whom D. on which ‎ Key: 1---6 DBDADB 15‎ 优才教育 定语从句（三）定语从句的难点The Attributive Clause 一、 只能使用that，不用which, who 的情况 ‎1. 当先行词是all, much, few, little, everything, anything, nothing, none, the one等不定代词时；‎ ‎①All that can be done has been done. 能做的都已经做了。‎ ‎②I didn’t mean this one; I mean the one that was bought yesterday. ‎ 我不是指这个，我是指昨天买的那个。‎ ‎2. 先行词被all, every, no, some, any, little, much, the only, the very, the right, few, just等词修饰时；‎ ‎①There’s no difficulty that we can’t overcome. 没有我们克服不了的困难。‎ ‎②I’ve read all the books that can be borrowed here. 我已经读完了这里能借的所有书。‎ ‎3. 先行词被序数词或形容词的最高级修饰，或先行词本身就是序数词或形容词最高级时；‎ ‎①This is the first letter that I’ve written in Japanese. 这是我用日语写得第一封信。‎ ‎②She is the most careful girl that I’ve ever known. 她是我认识的最认真的女孩。‎ ‎③He was the first that gave us some useful advice. 他是第一个给我们一些有用建议的人。‎ ‎4. 当先行词既有人又有物时；‎ ‎①They talked about the teachers and schools that they had visited. ‎ 他们谈论了他们见过的老师和学校。‎ ‎②The speaker talked of some writers and books that were unknown to us. ‎ 演讲者提到的一些作者和作品我们都不知道。‎ ‎5. 当主句是以who, which或what开头的特殊疑问句时；‎ ‎①Who is the man that is waiting at the bus stop? 在车站等车的那个人是谁？‎ ‎②Which is the car that overtook us yesterday? 昨天超过我们的是哪辆车？‎ ‎6. 当主句以There be…结构开头时，或关系代词在there be…结构中作实义主语，先行词为物。如：‎ ‎①There is a seat in the corner that is still free.‎ ‎②There are two tickets of the film that are for you.‎ 二、只能用which，不用that 的情况：‎ ‎1. 在非限制性定语从中。如：‎ The meeting was put off, which was exactly what we wanted. ‎ 会议延期了，这正是我们所希望的。‎ 15‎ 优才教育 ‎2. 定语从句由介词+关系代词引导，先行词是物时。如：‎ The thing about which he is talking is of great importance. ‎ 他考虑的这件事非常重要。‎ ‎3. 先行词本身是that时。如：‎ I don’t like that which he did. 我不喜欢他做的那件事。‎ 三、只用who不用that的情况 ‎1. 先行词是指人的不定代词，如one, anyone, no one, all, nobody, anybody, those等；‎ ‎①One who does not work hard will never succeed.‎ ‎②Anyone who breaks the law should be punished.‎ ‎③She is the only one of the students who has been to the USA.‎ ‎④Those who learn not only from books but also through practice will succeed.‎ ‎2. 在以there be…的句子中，先行词为人时；‎ There is a comrade outside who wants to see you.‎ ‎3. 当定语从句中又有定语从句，且先行词都为人时；‎ The student that won the first prize is the monitor who works hard.‎ ‎4. 当指人的先行词被一些指物的名词修饰时；‎ There’s only one student in the school who I want to see.‎ Do you know the woman in blue with a baby on her back who is working in the fields?‎ ‎5. 在非限制性定语从句中指人 I met a friend of mine in the street, who had just come from America.‎ 练一练 A. 单项选择 1. The radio set ________ last week has been out of order. ‎ ‎ A. I bought B. I bought it  C. which I bought it  D. what I bought ‎ 2. All the apples ________ fell down from the tree were eaten up by the pigs.  ‎ ‎ A. which B. / C. that  D. they ‎ 3. I can tell you ________ he told me last week.  ‎ ‎ A. all which B. all what C. that all D. all that ‎ 4. This is the biggest lab ________ we have ever built in our university. ‎ ‎ A. which B. what  C. that D. where ‎ 5. Is oxygen the only gas ________ helps fire burn?‎ ‎ A. that B. / C. which D. what ‎ 6. Air, ________ we breathe every day, is around us all the time.  ‎ 15‎ 优才教育 ‎ A. that B. / C. it D. which 1. This is the museum ________ we saw an exhibition the other day. ‎ ‎ A. that B. which C. where D. in that ‎ 2. This is the museum ________ you saw the other day. ‎ ‎ A. that B. where C. in which D. in that ‎ 3. He has left Beijing, ________ a meeting is to be held. ‎ ‎ A. when B. where C. as D. which ‎ 4. This is the very place ________ I’m wishing to live in. ‎ ‎ A. where B. which C. that D. in which ‎ 5. Is it in that factory ________ “Red Flag” cars are made?‎ ‎ A. in which B. where  C. which D. that 6. The reason ________ he didn’t come was ________ he was injured. ‎ ‎ A. that; because B. why; that C. why; because D. that; that ‎ 7. All ________ is needed is a supply of oil. ‎ ‎ A. the thing B. that C. what D. which ‎ 1. Finally, the thief handed everything ________ he had stolen to the police.‎ A. which B. what C. whatever D. that ‎ 2. He talked a lot about things and persons ________ they remembered in the school. ‎ A. which B. that C. whom D. what ‎ Key: 1---5 ACDCA 6---10 DCABC 11---15 DBBDB B. 把下列各句子合并成定语从句 1. John is a very kind-hearted man. You can turn to him for help. ‎ ‎_________________________________________________________________. ‎ 2. The book is written by that famous writer. I am very interested in it. ‎ ‎_________________________________________________________________. ‎ 3. Tom is the boy. I went to the cinema with him together. ‎ ‎_________________________________________________________________. ‎ 4. Have you remembered the factory? We worked in it last year. ‎ ‎________________________________________________________________? ‎ 5. It is the gold diamond. I spent all my money on it. ‎ ‎_________________________________________________________________. ‎ Key: ‎ ‎1. John is a very kind-hearted man whom you can turn to for help./ John is a very kind-hearted man to whom you can turn for help. ‎ ‎2. The book which I am very interested in is written by that famous writer./ The book in which I am very interested is written by that famous writer. ‎ ‎3. Tom is the boy whom I went to the cinema with together./ Tom is the boy with ‎ 15‎ 优才教育 whom I went to the cinema together. ‎ ‎4. Have you remembered the factory which we worked in last year?/ Have you remembered the factory in which we worked last year? ‎ ‎5. It is the gold diamond which I spent all my money on./ It is the gold diamond on which I spent all my money. ‎ C．改错 1. Is this hospital that they want to visit next week? ‎ ‎_________________________________________________________ ‎ 2. Is this the museum the one some German friends visited the other day? ‎ ‎_________________________________________________________ ‎ 3. He has two sons, each of them looks like him. ‎ ‎_________________________________________________________ ‎ 4. He will never forget the days when he spent with the villagers. ‎ ‎_________________________________________________________ ‎ 5. Please tell us about the people and interesting things which you have seen in America. ‎ ‎_________________________________________________________ ‎ 6. The knife which she often uses it to cut the bread is very sharp. ‎ ‎_________________________________________________________ ‎ 7. Please pass me the book that cover is red. ‎ ‎_________________________________________________________ ‎ 8. The sun heats the earth, that is very important. ‎ ‎_________________________________________________________ ‎ Key: ‎ ‎1. hospital前加the 2. 去掉museum前的the 3. 将them改为whom 4. 将when改为that 5. 将which改为that 6. 去掉it 7. 将that改为whose 8. 将that改为which ‎ D. 中考真题 1. ‎“What do you think of the school uniforms?” “Very good. I like clothes ________ make me feel comfortable.”‎ ‎ A. that B. what C. who 2. There will be a flower show in the park ________ we visited last week.‎ ‎ A. who B. when C. what D. Which 3. ‎—Now many people smoke and get ill. ‎ ‎—So we should do something ________ can help stop smoking. ‎ ‎ A. what B. who C. / D. that ‎ 15‎ 优才教育 1. I still remember the time ________ we spent together at Xisai Mountain last year.‎ ‎ A. when B. what C. who D. which ‎ 2. The little boy was wrapping the present ________ world be sent to his teacher.‎ A. who B. / C. what D. that 3. Mr. Smith ________ is smoking is looking for ________ she lost yesterday.‎ A. whom; which B. who; what C. that; who D. which; where 4. Success will belong to those ________ never say “impossible”.‎ A. whom B. what C. who D. which 5. ‎—What are you looking for?‎ ‎—I’m looking for the ring ________ my husband bought me last year.‎ A. that B. who C. whom D. it 6. I hate people ________ talk much but do little. ‎ A. who B. which C. whose D. whom 7. Piano is a word ________ was originally borrowed from Italian．‎ A. where B. who C. which D. whose 8. It’s interesting that there are many people ________ speak French in Canada. ‎ A. which B. where C. who 9. ‎—Do you enjoy My heart will go on?‎ ‎—No, I prefer songs ________ loud.‎ A. that is B. which is C. that are D. what are 10. I can never forget the stories ________ my grandma told me.‎ A. what B. who C. them D. that 11. This is the primary school ________ I studied three years ago. ‎ A. where B. when C. that D. which ‎ 12. Please pass me the cartoon book ________ has a Mickey Mouse on the cover.‎ A. whom B. whose C. who D. which 13. ‎—What kind of movies do you like?‎ ‎—I like the movie ________ are about Chinese history.‎ A. who B. whom C. whose D which 14. Most students like the teachers ________ understand them well A. who B. when C. what D. which 15. ‎—What are you looking for?‎ ‎—I’m looking for the pen ________ my father gave me last week.‎ A. who B. which C. whose D. whom 16. ‎—Do you know the girl ________ is helping the old lady.‎ ‎—Oh, that’s my sister.‎ A. whom B. whose C. who D. where 17. Steve Jobs is one of the persons ________ founded Apple Computer Company. His 15‎ 优才教育 ‎ death marked the end of an era (时代).‎ A. who B. whom C. which D. /‎ Key: 1---5 ADDDD 6---10 BCAAC 11---15 CCDAD 16-20DABCA 15‎