live on和must be和ought to英语知识点精析 1. “此前认为，原以为”的表达法：Ah, you are here. I thought you had gone home.啊，你在这儿，我原以为你已经回家了。      2. tell      tell sb. sth.  告诉某人某事      tell sb. to do sth.告诉某人做某事      tell the difference between A and B      说出A和B的区别      tell A from B  把A和B辨别出来  3. A is different from B A和B不同      tell the difference  说出区别      make a difference  有区别      make no difference  无区别    语法易错题 速记英语单词的方法 高中英语教材    4. 形容词最高级和序数词连用，表示“居第几位” The river is the second longest river in this city. 这条河是这个城市的第二长河。      5. cover a table with a cloth用一块台布铺桌子      cover fifty miles  走过五十英里      cover(an area of)2000 square metres   占地2000平方米     cover an event  采访这个事件     the cover of the book  书的封面      be covered with/by  覆盖      6. where引导状语从句      Put the book where it was. 请把书放回原处。  7. 连词加分词作状语      When asked where she was, she began to cry.   当问她来自哪里，她哭了起来。      Be careful when crossing the road.      过马路时要小心。      8. live on  靠……为生      depend on 依靠feed on  以……为主食      grow rich on  靠……变富      9. live on  以……为主食      live by靠(手段)生活live through经历，活过      live a happy life过幸福生活      a live concert  现场直播音乐会      a live boy一个活泼的男make a living  谋生      发散联想      It must be our teacher.      It can’t be our teacher.      Can it be our teacher?      make a mistake犯错by mistake  出于错误      mistake A for B  把A错当成B      Youre mistaken.  你错了。  She ought to help me.     她应该帮助我。      You ought to have told me about it. 你应该告诉我那件事。You oughtnt to have said to her like that.      你真不应该那样对她说话。(但事实说了)      get sb. to do sth.  叫某人做某事      get sth. done  使某事完成  get sth. doing  使某物动起来      have /let/make sb. do sth.  叫某人做某事     常见系动词      ①表感觉：feel,taste,smell,sound ... ②表状态：be,seem,appear ③表保持状态：remain,stay,keep,continue ... ④表状态变化：become,turn,get,grow,go,fall ... (2)fall behind   fall into a bad habit  fall down   fall off  fall to the ground  fall ill/sick/asleep/silent   have many falls  a heavy fall of rain一场大雨 (3) cut down砍倒   cut out切下，剪下   cup up切碎；剁碎cut down one’s expense减少开支 cut in插嘴 cut off切断(煤气、自来水等)  切断电话   使(人、城镇)孤立  cut open    have one’s hair cut    cuts on one’s arm (4) at ①同某些形容词或分(angry,delighted,glad,happy,sad surprised等)连用，表示引起某种情绪的原因. 意为“为”、“由于”、“对于”。 ② 表示速度、价格   at the speed / rate of   at full speed     at a high/low price ③ 表示“处于...状态”。  at war     at work      at rest in the bed ④用于时间上的某一点、  某一时刻或年龄 at 8 a.m.   at noon/night         at that time    at (the age of)16 ⑤表示“在……处；     在……旁；朝……” at the doctor’s   at the window