中学英语介词的用法

介词重要是用来表达它背面的名词或代词与句中其她某个成分之间的关系。不能独立充当句子成分，必须与背面的宾语构成介词短语后才干做句子成分。一. 介词（短语）语法功能1.作状语 介词（短语）在句子作状语修饰动词。表达“时间”，地点”,条件”,方式”或目的”等。例如:She gets up at 6:30 in the morning every day. (表时间) There are some books on the desk . (表地点) People cant live without air or water. (表条件)2.作定语介词短语作定语表达某个关系 ，一般放在它所修饰的名词或代词之后。例如 The girl in the red skirt is Lucy . (后置定语)3.作表语 介词短语作表语时，多放在be 动词之后。例如： She is in the next room . He is from English .二 . 常用介词的用法 1.表达时间的介词 in ,on ,at . in 表达世纪，年，周，季节，在上午下午晚上白天等 。 例如：in the morning in May in in his forties in an hour on 表达拟定的时间， 某日，某日的上午，下午，晚上，星期几，或一般节日等。 例如：on Sunday on a rainy evening on May 4 on the night of May 4 on Teachers Day on Childrens Day at 用于表达时间“点” .夜里.中午及某些词组中 例如 .at 4 oclock at noon at that time at the end of at the age of by ,untiltill 表达期限时一般用介词by ,until tillby表达“不迟于” ，“在 之前”例如：They had seen four English films by the end of last night.Until till到为止在肯定句中谓语动词要用延续性动词。例如： I waited for my mum until she came home .在否认句中，not until译成“直到才”谓语动词用非延续性动词 。例如：I didnt go to bed until my mum came home.in ,for ,during ,through1)in 表达“在。时间内”“在。时间后”例如 :Do you work in the day time or at night ? I hear hell be back in a week.2)for 后接一段时间，可与多种时态连用，如与目前完毕时连用，谓语动词只能用延续性动词。例如：She has worked there for 8 years.3)during表达“在。期间”，强调“自始自终”. 例如：During those days he asked a lot of questions .4)through =from beginning to end “自始自终”“从头到尾 ”例如：Dr. Bethune went on working through the night .注：对“in+时间段”提问用 how soon 对“for+ 时间段”提问用 how long On the+身体硬部位 in the +身体软部位表达时间的起点用since 或from例如：Tom has worked in the factory since three years ago. From now on ,I will learn English in the morning.in 和after 1)in “在。后来”从目前算起，后接时间段，常用于将来时。例如：Well be back in a week . Hell arrive at Shanghai in two days .2)after “在。后来”，从过去算起， 后接时间段，常用于过去时。例如：They got there after 8 hours. 后接时间点，常用于将来时。例如：The plane is leaving after nine. 2.表达地点.位置的介词 in on to atin 在某一范畴之内。例如：Shanghai lies in the east of China.on 表达两个不同的个体相邻或接壤。例如：Hefei lies on the south of Huainan.to表达两个个体间有一段距离或隔海相望。例如：Japan is to the east of China .At表达在街道或城乡。例如： He lives at 158 Jianguo Street.in at in后跟较大地方例如：He lived in China three years ago.at 后接较小地方例如：We waited at the gate of the school.above over on Above表达位置高于某物不接触，在其上方任意一点，但不是正上方。其反义词是below例如：The moon is now above the trees in the east .Over 指正上方,垂直方向。其反义词是under例如：There is a bridge over the river.On 在。上面，互相接触。例如：There is a pen on the desk . 特殊用法：on在树上There are some apples on the tree. in在树上There are some birds in the tree.3表达方向的介词：by with in by后跟动名词或抽象化的可数名词（其前不用冠词）意为“用手段或措施”例如: He goes to school by bus every day . The old man had to make money by selling vegetables. with 表达用工具， 借助于某一具体的手段，工具，材料或人体器官。例如：People here build houses with stones.With the help of my teacher ,I did well in my English .We see with our eyes.in 用材料.语言.声音等媒介，以方式.What is this in English ?She said in a loud voice.He wrote the words in red ink. 4.比较but,except,besides but表达“除。外”常与否认意义的词连用。当but前有动词do时，but 后接动词原形。 例如：Nobody knew it but me.除了我以外，没人懂得此事。 Last night I did nothing but repair my desk. except除。以外（不涉及在内） 例如：All the students went to the park except me. 注意：在否认句中 ，except 没有排除性。 例如：She knows nothing except English. Nobody came to see me except Tom. besides 除。外（涉及在内） 例如：Lily went to the park besides you. 5.of sb 与for sb的区别 It is +adj.+of sb .+to do sth adj.为clever ,kind ,nice 等词。 .It is +adj. +for sb .+to do sth adj.为easy ,necessary ,important等词 判断措施：sb +be +adj. 如成立则用of，不成立则用for。 例如：It is very kind of you to help me . You are kind to help me .(成立用of) Its important for us to learn English well. We are important to learn English well.(不成立，用for) 6.to 的两种用法的区别 to+v.(不定式) 例如：to do sth to+v-ing(介词) 例如：look fordward to doing sth get /be used to doing sth pay attention to doing sth make a contribution to doing sth prefer doing sth to doing sth 7.时间状语前不用介词的状况。 当morning等词前有this ,that ,next ,last 等词修饰时，介词须省去。 下列介词须省去： 修饰语 中心词 this /that morning/week /year/January/spring next /last Sunday /week /term/year/spring/May tomorrow/yesterday/last morning/afternoon/evening the day after tomorrow /before yesterday after/before/next the week /month one morning/evening/night/week/month/Monday morning