高中英语 知识点大全14 at的用法.doc

高中英语知识点大全（14）：at的用法1、at 词组at (the) least 至少；最少。反义词组为at (the)most至多；最多。mr smith looks older than his real age.in fact,he is at (the)most 40 years old.史密斯先生很显老，实际上他最多40岁。oh, really?i thought he was 50 years old at (the)least.噢，真的吗？我以为他至少50岁了。at the beginning of 在初（开头），可指时间与空间。如：at the beginning of term 在学期开始at the beginning of the book 在那本书的开头at the beginning 单独用时间at first，也可说in the beginning.比较：at the end of 在末（尽头） at the end 在末尾处in the end 最终，同at last in the middle of 在中期from beginning to end 从头至尾at the doctors该结构为介词+名词所有格，意为“在诊所”。所有格-s后一般接名词，如her mothers bike ,但有时这个名词可省略，主要表现在以下两个方面：指一个企业，机构，教堂，学校，医院，家庭，理发店，店铺时。如：she is at the hairdressers.为了避免重复，省略-s后的名词。如：i have read some of shaws plays,but none of shakespeares.at the last moment在最后关头at the moment 此刻；正在那时for a moment片刻，一会儿for the moment 目前，暂时； in a moment立刻，马上at the top of在的顶部，上方； at the top of a mountain在山顶；at the top of ones voice高声地，尖声地at war该介宾词组意思是“处于战争或交战状态”。在句中常作表语。如：the u.s.a.and iraq are at war again.2、at/ with/ through三个介词都可表示原因，at表示听到或看到的原因；with表示人体外部的原因；through 强调自身的原因。如：be sad at the news听了这个消息而悲伤；be frightened at the sight看了那个情景而害怕；jump up with joy高兴地跳了起来；turn red with anger气得脸红；shake with cold/fear冻得/害怕得发抖；with pleasure高兴地；with pride 骄傲地；with satisfaction满意地；make the mistake through his carelessness由于粗心而出错；be put into prison through no fault of his own 没有任何罪过被关进监狱。应用汉译英听到这个消息，全国人民处于悲哀之中。孩子们高兴地跳了起来。由于大意他犯了这个错误。key:at the news, the whole country was in deep sorrow.the children jumped up with joy.he made the mistake through his carelessness.3、at work/ out of work/ after work这三个以work为中心词的介词短语，在意思和用法上均不相同。(1)at work表示“在工作、在上班”，作表语或状语。例如：they are both at work today.今天他们俩都在上班。his father had an accident at work last week.上周的父亲在工作时出了事故。(2)out of work表示“失业”，是介词短语，相当于lost ones job或be unemployed。例如：if you dont work hard, youll be out of work.如果你不好好工作就会失业。youll be out of work if you keep coming late.如果你老是迟到，你会失业的。(3)after work表示“下班后”，作时间状语