初中语法解释及例句.doc

初中语法大全一、一般时态 1、一般现在时 (1)一般现在时表示没有时限的持久存在的动作或状态或现阶段反复发生的动作或状态，常和副词usually，often，always sometimes， regularly，near，occasionally，every year, every week等连用。例如： 1)The moon moves round the earth. 2)Mr. Smith travels to work by bus every day. (2)在由after，until，before，once，when，even if，in case，as long as，as soon as，the moment以及if，unless等引导的时间状语从句或条件状语从句中，通常用一般现在时代替将来时。例如： 1)I will tell him the news as soon as I see him. 2)I will not go to countryside if it rains tomorrow. (3)某些表示起始的动词，可用一般现在时表示按规定、计划或安排要发生的动作，这类动词有：be，go，come，start，depart，arrive，begin，leave等。例如： 1)The plane leaves at three sharp. 2)The new teachers arrive tomorrow. (4)在由why，what，where，whoever，who，that，as等引导的从句中，也常用一般现在时代替将来时。例如： 1)Free tickets will be given to whoever comes first. 2)Youll probably be in the same train as I am tomorrow.2.一般过去时 (1)表示过去某一特定时间所发生的、可完成的动作或状态，常与表示确切过去时间的词、短语或从句连用。例如： We went to the pictures last night and saw a very interesting film. (2)表示过去习惯性动作。例如： 1)He always went to class last. 2)I used to do my homework in the library. (注意与be used to doing短语的区别) 3.一般将来时 1)表示将来打算进行或期待发生的动作或状态。例如： I shall graduate next year. 2)几种替代形式： 1)be going to +v在口语中广泛使用，表示准备做或将发生的事情。例如： Im going to buy a house when weve saved enough money. 2)be to +v表示计划安排要做的事，具有“必要”的强制性意义。例如： I am to play tennis this afternoon. 3)be about to +v表示即将发生的事情。例如： He was about to start. 4)be due to +v表示预先确定了的事，必定发生的事。例如： The train is due to depart in ten minutes. 5)be on the point/verge of +v ing强调即将发生的某种事态。例如： The baby was on the point of crying when her mother finally came home. 二、进行时态 1.现在进行时 (1)表示现在正在进行的动作，常与now，right now，at the mother，for the time being，for the present等连用。例如： Dont disturb her. She is reading a newspaper now. (2)表示现阶段经常发生的动作，常与always，continually，forever，constantly等连用。例如： My father is forever criticizing me. (3)表示根据计划或安排在最近要进行的事情。具有这种语法功能的动词仅限于过渡性动词。即表示从一个状态或位置转移到另一个状态或位置上去的动词。常用的有：go，come，leave，start，arrive，return等。例如： They are leaving for Hong Kong next month. (4)有些动词不能用进行时，这是一类表示“感觉，感情，存在，从属”等的动词。如：see，hear，smell，taste，feel，notice，look，appear，(表示感觉的词)；hate，love，fear，like，want，wish，prefer，refuse，forgive(表示感情的动词)；be，exist，remain，stay，obtain(表示存在状态的动词)；have，possess，own，contain，belong，consist of，form(表示占有与从属的动词)；understand，know，believe，think，doubt，forget，remember(表示思考理解的动词)。但是如果它们词义改变，便也可用进行时态。例如： 1)Tom looks pale. Whats wrong with him? (look在此为联系动词，意为“显得，看上去”) 2)Tom is looking for his books. (look在此为实义动词，意为“寻找”) 2.过去进行时 过去进行时表示一个过去的动作发生时或发生后，另一个过去的动作正在进行，或表示过去反复的习惯，常与always，continually，constantly等动词连用。例如： 1)We were discussing the matter when the headmaster entered. 2)Whenever I visited him, he was always writing at the desk. 3.将来进行时 将来进行时主要表示将来某一时刻正在进行的动作，或表示要在将来某一时刻开始，并继续下去的动作。常用来表示礼貌的询问、请求等。例如： 1)This time next day they will be sitting in the cinema. 2)What will you be doing at six tomorrow evening? 4.完成进行时 (现在、过去、将来)完成进行时是(现在、过去、将来)完成时的强调形式，将放在完成时态部分讲述。 三、完成时态 完成时态通常表示已完成或从事的动作。它可分为： 1.现在完成时 (1)现在完成时用来表示对目前状况仍有影响的，刚刚完成的动作(常与yet，already，just连用)，或者过去某一时刻发生的，持续到现在的情况(常与for，since连用)。例如： 1)I have just finished my homework. 2)Mary has been ill for three days. (2)常与现在完成时连用的时间状语有：since, for, during, over等引导出的短语；副词already, yet, just, ever, now, before, often, lately, recently等；状语词组this week (morning, month, year), so far, up to now, many times, up to the present等。例如： 1)I havent been there for five years. 2)So far, she hasnt enjoyed the summer vacation. 3)There have been a lot of changes since 1978.(3)完成时态可用在下列结构中： This (That, It) is (was) the first (second) time +定语从句；This (That, It) is (was) the only (last) + n +定语从句；This (That, It) is (was) +形容词最高级+ n +定语从句。如果主句的谓语动词是一般现在时，从句的谓语动词通常用现在完成时；如果主句谓语动词是一般过去时，从句谓语动词通常用过去完成时。例如： (1)This is one of the rarest questions that have ever been raised at such a meeting. (2)There was a knock at the door. It was the second time someone had interrupted me that evening. 2.过去完成时 (1)表示过去某时间前已经发生的动作或情况，这个过去的时间可以用by，before等介词短语或一个时间状语从句来表示；或者表示一个动作在另一个过去动作之前已经完成。例如： 1)We had just had our breakfast when Tom came in. 2)By the end of last year they had turned out 5, 000 bicycles. (2)动词expect, hope, mean, intend, plan, suppose, wish, want, desire等用过去完成时，表示过去的希望、预期、意图或愿望等没有实现。例如： I had meant to take a good holiday this year, but I wasnt able to get away. 另外两种表示“过去想做而未做的事”的表达方式是： 1)was / were + to have done sth,例如： We were to have come yesterday, but we couldnt. 2)intended (expected, hope, meant, planned, supposed, wished, wanted, desired) + to have done sth,例如： I meant to have told you about it, but I forgot to do so. (3)过去完成时常用于以下固定句型： 1)hardly, scarcely, barely + 过去完成时+ when + 过去时。例如： Hardly had I got on the bus when it started to move. 2)no sooner +过去完成时+ than +过去时。例如： No sooner had I gone out than he came to see me. 3)by (the end of ) +过去时间，主句中谓语动词用过去完成时。例如： The experiment had been finished by 4 oclock yesterday afternoon. 3.将来完成时 将来完成时表示在将来某一时刻将完成或在另一个未来的动作发生之前已经完成的动作；也可以用来表示一种猜测。常与将来完成时连用的时间状语有：by (the time / the end of ) +表示将来时间的短语和句子；before (the end of ) +表示将来时间的词语或句子；when, after等加上表示将来动作的句子等。例如： 1)By this time tomorrow you will have arrived in Shanghai. 2)I shall have finished this composition before 9 oclock. 3)When we get on the railway station, the train will probably have left. 4.完成进行时 完成进行时是完成时的强调形式，有现在完成进行时，过去完成进行时，将来完成进行时。 (1)现在完成进行时表示过去某一时刻之前开始的动作或状态一直延续到过去某一时刻。例如： I have been looking for my lost book for three days, but I still havent found it. (2)过去完成进行时表示过去某一时刻之前开始的动作或状态一直延续到过去某一时刻。例如： It had been raining cats and dogs for over a week and the downpour had caused landslides in many places. (3)将来完成进行时表示在将来某一时刻之前开始的一个动作或状态一直延续到将来某一时刻。例如： By the time you arrive tonight, she will have been typing for hours. 四：时态一致 1、当主句谓语使用现在时或将来时，从句的谓语根据具体情况使用任何时态 He says that he lives in Wuhan. We hope that there will be many people at your party today. “Did you hear that Bill finally sold the house?” “Yes, but I dont know who bought it.” “Theres a lot of excitement on the street.” “There certainly is. Do you suppose the astronauts have returned?” 2、当主句谓语使用过去时的时候，从句的谓语必须使用过去范围的时态 He said he was writing a novel. The teacher wanted to know when we would finish the experiment. He said his father had been an engineer. 3、当从句是表示没有时间概念的真理时，从句的谓语应使用一般现在时。例如： The teacher told them since light travels faster than sound, lightning appears to go before thunder. 注：在此种情况下，即使主句谓语用了过去式的各种时态，从句谓语也应用一般现在时。 4、从句谓语只能用虚拟语气的情况利用时态一致原则确定从句动词时态时，还应注意，若主语动词是表示命令、请求、要求、建议、劝告等的动词，从句谓语只能用虚拟语气，不能遵循时态一致原则。例如： We insisted that we do it ourselves. 动词的语态 语态也是动词的一种形式，英语有两种语态：主动语态和被动语态。主动语态表示主语是动作的执行者，而被动语态表示主语是动作的承受者。 1)We use electricity to run machines. (主动语态) 2)Electricity is used to run machines. (被动语态) 1.不能用于被动语态的动词和短语 (1)在英语中，不及物动词不能用于被动语态，但有些不及物动词(包括短语)容易引起误用。如：appear, belong, belong, die, escape, fall, happen, last, remain, succeed, occur, come true, take place, consist of。 (2)某些表示状态或特征的及物动词，如：become, contain, cost, fit, have, resemble, suit也没有被动语态。一动词be（is,am,are）的用法：说明身份，年龄，状态等。口诀：我(I)用am, 你(you)用are，is跟着他(he)，她(she)，它(it)。单数名词用is，复数名词全用are。变否定，更容易，be后not加上去。变疑问，往前提，句末问号莫丢弃。还有一条须注意，句首大写莫忘记。be动词的用法：be动词包括“am”, “is”, “are”三种形式。第一人称单数(I)配合am来用。 句型解析析：I am+I am a student. I am a boy.第二人称(You)配合are使用。句型解析：You are+ You are my good friend. You are a good person.第三人称单数(He or She or It)配合is使用。句型解析：She(He, It) is + She is a good girl. She is so cute.人称复数 (we /you/they)配合are使用。句型解析：We (You, They) are + We are in Class 5,Grade 7. You are good students.注意：1 综合解析当使用be动词的时候，前面请先加上第几人称。be动词前面的人称，是不可随意替换的。例如：I am, You are, She is，并不会出现I is, You am, She are 这样的情形。2 当只有第一人称和第二人称或第三人称时应该把第二人称或第三人称放在前例如:you and I, Tom and I 当第二人称和第三人称放在一起时把第二人称放在前面，例如：you and Tom 当三者都有时，排序为：2 3 1例如you, Tom and I练习：1. Where _ Ann . She _ here. 2. How old _ you . I _ thirteen. 3. _ you Mr Read . Yes, I _. 4. What _ your name. My name _ Ann二 情态动词Can 1 can作“能、会”解，否定式是cannot，缩写为cant。 “can+动词原形” “cant+动词原形” ：表示某人能做或不能做某事Can 是情态动词，没有人称和数的变化。Can 表示的”能力”为现在的能力，而不是过去或将来的能力。1). for ability表示能力。例如： Can you write in English? Yes, I can. I can run fast,can you? 2). indicating acquired knowledge or skill表示获得的知识或技能。例如： Can she speak Japanese? No, she cant.她会说日语吗？不，她不会。 3). indicating permission表示许可。例如： Can I read your newspaper?我能看看你的报纸吗？ Can I take you home?我送你回家行吗？ We cant wear jeans at work.我们上班时不准穿牛仔裤。 4). indicating requests表示要求。例如： Can you help me with this box?你能帮我弄这个箱子吗？ Can you feed the cat?你喂喂猫好吗？ 5). indicating possibly表示可能性。例如： That cant be Maryshes in hospital.那不可能是玛丽她住院了。 He cant have slept through all that noise.那么吵他不可能睡得着觉。 Theres someone outsidewho can it be?外面有人会是谁呢？ 6). used to make suggestions用以提出建议。例如： We can eat in a restaurant, if you like.你愿意的话，咱们可以在饭馆吃饭。 I can take the car if necessary.必要时我可以开车去。三 情态动词Would 1 Would是will的过去式，可用于各人称，表示过去时间的意志、愿望和 决心等。如：I told peter that I would go along wit him.我告诉彼得我要跟他一块去。2 would用来表示现在时间时时，不论是表达说话人本身的意志或向对方提出请求，均较will婉转。如：Would you like to have a glass of wine? 你要喝杯酒吗?Would you please tell me the way to the nearest bus-stop? 注在日常会话中，I would like to和I should like to都可以说，I would like的简略式为Id like。如：yes, Id like to. Yes, Id love to Yes, very much. Sorry, ai already have an appointment. 3 Would还可以表示过去习惯发生的动作I found that retired persons would often go to the park to play chess.我发现退休的人经常到公园里下棋。When he had a problem to solve，he would work at it until he found an answer.当他有个问题要解决时，他总是想办法一直到找到答案为止。练习：1 -Can you speak Japanese? -No, I_A_.A. mustnt B. cant C. neednt D. may not2 The children_ play football on the road.A. cant B. can C. mustnt D. must3 -Shall we go and visit the History Museum next Sunday?A. Here you are B. Sorry, I cant C. Yes, please D. Let me try4 Excuse me. _ you please pass me that cup?A. Do B. Should C. Would D. Must5 _ you like to have another try?A. Could B. Will C. Would D. Do6 -Would you like to go boating with us? -Yes, _.A. Id like B. I want C. Id like to D. I do四 “there be”句型There be句型主要用以表达“某处（某时）有某人（某物）。”其基本结构为“There be某物（某人）某地（某时）”其中there是引导词，没有词义；主语是be后面的名词， be是谓语动词，在一般现在时中be只用is和are两种形式。There be句型中的be动词如何确定呢？请先看看下面这首歌诀：Be动词，有三个，am，is还有are。“There be”真特别，不留am只留俩，那就是is还有are。要用is还是are，须看其后的名词是单数还是复数。若是单数或不可数名词用is，否则就用are。如：There is a tree behind the house.There is some water（水）in the bottle（瓶子）.There are some pears in the box.(3)注意：如果“be”后的主语是由and连接的两个或两个以上的名词，那么be的形式要遵循“远亲不如近邻”的原则。也就是说，“be”的形式是由与它最近的那个名词来确定的。若那个名词是单数或不可数名词要用is，是复数就用are。如：There is a book and some pens on the floor.There are some pens and a book on the floor.肯定句：there is an apple on the table否定句：there isnt an apple on the table.一般疑问句: Is there an apple on the table? 回答:yes, there is. / No, there isnt特殊疑问句：what is there on the table.1. 定义：There be句型表示某处存在某物或某人。2. 结构：(1) There is +单数可数名词/不可数名词+ 地点状语.(2) There are +复数名词+地点状语.there是引导词，在句中不充当任何成分，翻译时也不必译出。句子的主语是某人或某物，谓语动词be要与主语（某人或某物）的数保持一致。当主语是两个或两个以上的名词时，谓语动词要与跟它最近的那个名词一致。 There is a bird in the tree. 树上有一只鸟。 There is a teacher and many students in our classroom.我们教室里有一位老师和许多学生。 There are two boys and a girl under the tree. 树下有两个男孩，一个女孩。3.There be句型与have的区别：(1) There be 句型和have都表示“有”的含义。区别如下：There be表示“某处存在某物或某人”；have表示“某人拥有某物/某人”，它表示所有、拥有关系。 eg.He has two sons. 他有两个儿子。There are two men in the office. 办公室里有两个男人。(2)当have表示“包括”、“存在”的含义时，There be 句型与其可互换。A week has seven days. =There are seven days in a week.一个星期有七天。4 变脸一：否定句There be句型的否定式的构成和含有be动词的其它句型一样，在be后加上not或no即可。注意not和no的不同：not是副词，no为形容词，not a/an/any + n. 相当于no+ n.。例如：There are some pictures on the wall. There arent any pictures on the wall. =There are no pictures on the wall.There is a bike behind the tree. There isnt a bike behind the tree.=There is no bike behind the tree.5 变脸二：一般疑问句There be句型的一般疑问句变化是把be动词调整到句首，再在句尾加上问号即可，此为调整法。但同时要注意：当肯定句中有some时，要将其改为any（否定变化也一样）。看看下面两句是如何改头换面的吧：There is some water on Mars. Is there any water on Mars?There are some fish in the water. Are there any fish in the water?6 变脸三：特殊疑问句There be句型的特殊疑问句形式有以下三种变化： 对主语提问：当主语是人时，用Whos+介词短语?；当主语是物时，用Whats + 介词短语?。注意：无论原句的主语是单数还是复数，对之提问时一般都用be的单数形式(回答时却要根据实际情况来决定)。如：There are many things over there. Whats over there?There is a little girl in the room.Who is in the room? 对地点状语提问：提问地点当然用Where is / are+主语?啦！例如：There is a computer on the desk. Where is the computer?There are four children on the playground. Where are the four children? 对数量提问：一般有两种句型结构：How many+复数名词+are there+介词短语？How much+不可数名词+is there+介词短语？练习：五 “have got”六 序数词七 一般现在时一般现在时：1) 它表示经常性、习惯性的动作或存在的状态。e.g. I go to school on foot. He is very busy now. 2)表示主语的特征、性格、能力、爱好等。e.g. He can swim. I work hard. I like watching TV. 3)表示客观真理，表示格言或警句中e.g. There are seven days in a week. The moon moves round the earth. 一 其结构按正常语序，即“主语+谓语+其它”，有时为了起强调作用，时间状语也可提前.二 其句式变化可分为两种情况 1)表示动作， 一般人称作主语的，变否定句须在动词前加助动词dont；变一般疑问句须在句首加助动词do。 They have lunch at 12:00. They dont have lunch at 12:00. Do they have lunch at 12:00?2）单三人称做主语的，变否定句须在动词前加助动词doesnt；变一般疑问句须在句首加助动词does。Jenny speaks English very well. Jenny doesnt speak English very well. Does Jenny speak English very well? 含有be动词的要在be上做变化. E.g. Danny is a good student. Danny isnt a good student. Is Danny a good student?三 其时间状语为often、 usually、 always、 sometimes等频率副词，on Saturdays、 in the morning(afternoon evening) 、every day 等。 做题时常见错误如下：一、be动词与行为动词同时出现在句子中例：We are plant (plant) the trees in spring.解析：学生往往会用汉语的思维方式去翻译，就成了“我们是在春天植树”。这是学习英语最忌讳的，要看语法是不是正确，在英语中，be是表状态，do是表动作，两种动词不能同时出现在句子中，可记住如下口诀：“英汉语言有差异，be 、do不能放一起，仔细琢磨细分析，语法千万要牢记。”二、单三人称形式易出错例：1 He plaies (play) football very well.2 Danny gos (go) to school at 7:10. 答案：1 plays 2 goes 解析：1以辅音字母加y结尾的动词变单三人称形式才能把y换成i再加es；2与名词变复数不同，变单三人称形式以o结尾的词要加es.三、在句式变换时易出错例：1 Does Jenny has (has) a good friend?2 Brian doesnt lives (not live) in China. 答案：1 Does have 2 doesnt live 解析：单三人称做主语的一般现在时做句式变化时，可记住如下口诀：“见助动，用原形”。此口诀也可推广用于一般过去时态中。e.g. He didnt go home yesterday.四、对do的理解易出错例：We dont (not do) our homework in the afternoon. 答案：dont do解析：do是一个比较难理解的词，它有三个含义: a)是所有行为动词的总称；b)是助动词，无实义；c)是一个具体的行为动词“做，干”。此句中给出的do指“做，干”，not指把此句变为否定句，故须在do前加助动词dont。五、对主语的数判断有误例： Li Ming with me are (be) in Beijing. 答案: is 解析:表面一看是“我和李明两个人在北京”，但with在此做伴随状语，不能做主语，故用is.另外，宾语从句中，从句部分若是表示客观真理，不管主句是何时态，从句都要用一般现在时；在时间和条件状语从句中，主句表将来，从句要用一般现在时。练习：1 Jenny _ in an office. Her parents _in a hospital.A work works B works work C work are working D is working work2 One of the boys_ a black hat.A have B there is C there are D has3 We will go shopping if it_ tomorrow.A dont rain Bdidnt rain Cdoesnt rain Disnt rain 4 He said the sun _in the east and _in the west.A rose; set B rises; sets C rises, set D rise; sets5 Wang Mei _ music and often _ to music.A like; listen B likes; listens C like; are listening D liking ; listen6 Jenny_ English every evening.A has study B studies C study D studied答案：1 B 2D 3C 4B 5B 6B1 I can take Li Ming there when he _ ( come) to visit.2 _your sister_(know)English?3Her home_ _ _(远离 )her school.4The pot_(not look) like yours very much.5 Where _you_(have)lunch every day?6 Who_(想要 )to go swimming?7 _she_(do) the housework every day?8 Jenny and Danny usually_(play) games in the afternoon .答案：1 comes 2 Does know 3 is away from 4 doesnt look 5 do have 6 wants 7 does do 8 play补充知识点：一this，that和it用法(1)this和that是指示代词，it是人称代词。(2)距离说话人近的人或物用this, 距离说话人远的人或物用that。如：This is a flower. 这是一朵花。(近处)That is a tree. 那是一棵树。(远处)(3)放在一起的两样东西，先说this, 后说that。如：This is a pen. That is a pencil. 这是一支钢笔。那是一支铅笔。(4)向别人介绍某人时说This is, 不说That is。如：This is Helen. Helen, this is Tom. 这是海伦，海伦，这是汤姆。(5)This is 不能缩写, 而That is可以缩写。如：This is a bike. Thats a car. 这是一辆自行车。那是一辆轿车。(6)打电话时，介绍自己用this, 询问对方用that。如：Hello! Is that Miss Green? 喂，是格林小姐吗？Yes, this is. Whos that? 是的，我是，你是谁？注意：虽然汉语中使用“我”和“你”，但英语中打电话时绝不可以说：I am, Are you？/Who are you?(7)在回答this或that作主语的疑问句时, 要用it代替this或that。如：Is this a notebook? 这是笔记本吗？ Yes, it is. 是的，它是。Whats that? 那是什么？ Its a kite. 是只风筝。二 these和those用法this, that, these和those是指示代词，these是this的复数形式,指时间,距离较近的或下面要提到的人或事;those是that的复数形式,指时间、距离较远或前面已经提到过的人或事物。This is my bed. That is Lilys bed. 这是我的床。那是莉莉的床。These pictures are good. 那些画很好。 Are those apple trees? 那些是苹果树吗？在回答主语是these或those的疑问句时，通常用they代替these或those以避免重复。Are these/those your apples? 这些(那些)是你的苹果吗？Yes, they are. 是的，他们是。三不定冠词a和ana和an都是不定冠词，表示一(个，支，本，块)的意思，但不强调数量概念，而是强调类别，用来限定名词。a用在辅音素开头的单数名词前，如：a pencil(一支铅笔)，a book(一本书)；an用在元音音素开头的名词前，如an eraser(一块橡皮)。如果名词前有修饰语，用a还是用an，则以该修饰语的第一音素决定用a还是用an。如：a clock 一座钟 an old clock 一座旧钟 a book 一本书 an English book 一本英语书a nice apple 一个可爱的苹果 an apple 一个苹果四 名词s所有格名词s所有格 单数名词后直接加 “ s ”Jims coat 吉姆的外套 Jeffs mother杰夫的妈妈以s结尾的复数名词，只