1、重难点语法知识汇总一、语法易错点1. a, an的选择: 元音音素开头的单词用an,辅音音素开头的单词用a. 2. am , is , are的选择: 单数用is , 复数用are. I 用 am , you 用 are. 3. have , has 的选择: 表示某人有某物.单数用has , 复数用have. I ,you 用 have . 4. there is, there are 的选择:表示某地有某物,某人.单数用there is , 复数用there are. 5. some, any 的选择:肯定句用some, 疑问句和否定句用any. 6. 疑问词的选择:what (什么) w
2、ho (谁) where (哪里) whose (谁的) why(为什么)when(什么时候)which(哪一个)how old (多大) how many (多少)how much(多少钱) 二:形容词比较级当我们需要对事物作出比较时,需要用到比较级.比较级的句子结构通常是: 什么 + 动词be (am , is , are ) + 形容词比较级 + than(比)+ 什么 ,如: Im taller and heavier than you. (我比你更高和更重.) An elephant is bigger than a tiger. (一只大象比一只老虎更大.) 形容词的比较级是在形容
3、词的基础上变化而来的,它的变化规则是: 一般的直接在词尾加er ,如 tall - taller , strong - stronger , 以e结尾的,直接加r ,如 fine finer , 以辅音字母加y结尾的,先改y为i再加er,如funny - funnier 双写最后的字母再加er,如big bigger, thin thinner ,hot hotter 注意 比较的两者应该是互相对应的可比较的东西. 典型错误:My hair is longer than you.(我的头发比你更长.) 比较的两者是我的头发,你(整个人),那么比较的对象就没有可比性. 应该改为:My hair
4、is longer than yours. 或My hair is longer than your hair. 三:动词过去式动词的过去式的构成规则有:A,规则动词 一般直接在动词的后面加ed:如 worked , learned , cleaned , visited 以e结尾的动词直接加d:如 lived , danced , used 以辅音字母加y结尾的动词要改y为i再加ed(此类动词较少)如 study studied carry carried worry worried (注意play,stay不是辅音字母加y,所以不属于此类) 双写最后一个字母(此类动词较少)如 stoppe
5、d B,不规则动词(此类词并无规则,须熟记)小学阶段要记住以下动词的原形和过去式:sing sang , eat ate , see saw , have had , do did , go - went , take - took , buy - bought , get - got , read - read ,fly - flew , am/is - was , are - were , say - said , leave - left , swim - swam , tell - told , draw - drew , come - came , lose - lost , fin
6、d - found , drink - drank , hurt - hurt , feel - felt 四:动词现在分词详解 一般的直接在后面加上ing , 如doing , going , working , singing , eating 以e 结尾的动词,要先去e再加ing ,如having , writing 双写最后一个字母的(此类动词极少)有:running , swimming , sitting , getting 五、人称代词主格及宾格人称代词分为主格和宾格，主格和宾格区别：主格和宾格汉语意思相同，但位置不同。Eg:I(主格)我- me (宾格)我主格在陈述句中通常放句
7、首，宾格通常放在动词后或介词后，也就是说宾格，不放在句首。Eg :I have a new car.( I 主格)Excuse me (me 宾格)I ask him to go (him 宾格)They sit in front of me (me 宾格)主格(8个)：I 我you你 he他 she她 it它 we 我们you 你们they他(她、它)们宾格(8个)：me我 you你 him 他her她 it它 us我们 you你们 them他(她、它)们六:句型专项归类1.肯定句:是指用肯定的语气来陈述的句子,如:Im a student. She is a doctor. He work
8、s in a hospital. There are four fans in our classroom.2,否定句:含有否定词或表示否定意义词的句子,如:Im not a student. He does not (doesnt) work in a hospital. There are not (arent) four fans in our classroom. 注意 小结:否定句主要是在肯定句的基础上加上了否定词 not.有动词be的句子则not加在be后面,可缩写成isnt,arent,但am not 一般都分开写.没有动词be的句子则要先在主要动词的前面加上一个助动词(do,d
9、oes,did),然后在它后面加上not,你也可以把它们缩写在一起如dont , doesnt , didnt ).这三个助动词要根据人称和时态来选择,其中does只用于一般现在时主语是第三人称单数的情况,而did只用于一般过去时,不论主语是什么人称和数,都用did . 3,一般疑问句:是指询问事实的句子,此类句子必须用yes,或no来回答. 如:Are you a student ？Yes, I am No, Im not.Is she a doctor？Yes, she is. No, she isnt.Does he work in a hospital ？Yes, he does. /
10、 No, he doesnt.Did you watch TV yesterday evening? Yes, I did. / No, I didnt. 注意 小结:一般疑问句是在肯定句的基础上, 把动词be调到首位,其他照写,末尾标点符号变成问号即可. 没有动词be的句子则要在句首加上一个助动词(do,does,did)再把紧跟在后面的动词变回原形,末尾标点符号变成问号即可. 这三个助动词也要根据人称和时态来选择,其中does只用于一般现在时主语是第三人称单数的情况,而did只用于一般过去时,不论主语是什么人称和数,都用did .一般疑问句有个重要的原则就是问和答要一致,即问句里的第一个单
11、词(助动词)和简略答句里的这个词是一致的. 4,特殊疑问句:以特殊疑问词(what , where , who , which , when , whose , why , how等)开头引导的句子.此类句子应该问什么就答什么,不能用yes ,no来回答.如: What is this？Where are you going？Who played football with you yesterday afternoon？ When do you usually get up？Why do you like spring best ？How are you？注意 小结:其中how又可以和其他一
12、些形容词连用组成特殊疑问词组用来提问,如: how many(多少(数量), how much(多少(钱), how tall(多高), how long(多长), how big(多大), how heavy(多重) 例句:How many pencils do you have ？How many girls can you see ？how many 用来提问可数名词的数量,主要有以上三种搭配, How many + 名词复数 + do you have 你有多少 How many + 名词复数 + can you see 你能看见多少 How many + 名词复数 + are the
13、re 有多少 七:完全,缩略形式1、简缩形式的变法：把倒数第二个字母，通常是元音字母变成 但are除外，are要把a打成 。Eg:he is=hes they are=theyre2、简缩形式和完全形式的汉语意思相同。3、把完全形式变成简缩形式时，一定要注意第一个字母的大小变化。Eg:What is =Whats4、记住一个特殊变化;lets =let us 让我们(不要把 变成i) 5、记住：this is 没有简缩形式thiss(错误)6.常见的缩略形式：Im=I am hes=he is shes=she is theyre=they are youre=you are theres=there is theyre=they are cant=can not dont=do not doesnt=does not isnt=is not arent=are not lets=let us wont=will not Ill=I will wasnt=was not