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求八年级英语知识点归纳,

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求八年级英语知识点归纳,
1) leave的用法
1.“leave+地点”表示“离开某地”.例如:
   When did you leave Shanghai? 你什么时候离开上海的?
2.“leave for+地点”表示“动身去某地”.例如:
   Next Friday, Alice is leaving for London. 下周五,爱丽斯要去伦敦了.
3.“leave+地点+for+地点”表示“离开某地去某地”.例如:
   Why are you leaving Shanghai for Beijing? 你为什么要离开上海去北京?
2) 情态动词should“应该”学会使用
should作为情态动词用,常常表示意外、惊奇、不能理解等,有“竟会”的意思,例如:
  How should I know? 我怎么知道?
Why should you be so late today? 你今天为什么来得这么晚?
  should有时表示应当做或发生的事,例如:
  We should help each other.我们应当互相帮助.
我们在使用时要注意以下几点:
1. 用于表示“应该”或“不应该”的概念.常指长辈教导或责备晚辈.例如:
   You should be here with clean hands. 你应该把手洗干净了再来.
2.用于提出意见劝导别人.例如:
   You should go to the doctor if you feel ill. 如果感觉不舒服,你最好去看医生.
3. 用于表示可能性.should的这一用法是考试中常常出现的考点之一.例如:
   We should arrive by supper time. 我们在晚饭前就能到了.
   She should be here any moment. 她随时都可能来.
3) What...? 与 Which...?
 1. what 与 which 都是疑问代词,都可以指人或事物,但是what仅用来询问职业.如:
   What is your father? 你父亲是干什么的?
    该句相当于:
    What does your father do?
    What is your father's job?
    Which 指代的是特定范围内的某一个人.如:
    ---Which is Peter? 哪个是皮特?
    ---The boy behind Mary. 玛丽背后的那个男孩.
2.What...? 是泛指,所指的事物没有范围的限制;而 Which...? 是特指,所指的事物有范围的限制.如:
    What color do you like best?(所有颜色)你最喜爱什么颜色?
    Which color do you like best, blue, green or yellow?
    你最喜爱哪一种颜色? (有特定的范围)
  3. what 与 which 后都可以接单、复数名词和不可数名词.如:
    Which pictures are from China? 哪些图片来自中国?
4) 频度副词的位置
  1.常见的频度副词有以下这些:   
always(总是,一直)
usually(通常)
often(常常,经常)
sometimes(有时候)
never(从不)
2.频度副词的位置:
   a.放在连系动词、助动词或情态动词后面.如:
    David is often arrives late for school.大卫上学经常迟到.
   b.放在行为动词前.如:
    We usually go to school at 7:10 every day.我们每天经常在7:10去上学.
   c.有些频度副词可放在句首或句尾,用来表示强调.如:
    Sometimes I walk home, sometime I ride a bike.
     有时我步行回家,有时我骑自行车.
3.never放在句首时,主语、谓语动词要倒装.如:
   Never have I been there.我从没到过那儿.
5) every day 与 everyday
1. every day 作状语,译为“每一天”.如:
  We go to school at 7:10 every day.
    我们每天7:10去上学.
    I decide to read English every day.
    我决定每天读英语.
  2. everyday 作定语,译为“日常的”.
    She watches everyday English on TV after dinner.
    她晚饭后在电视上看日常英语.
    What's your everyday activity?  你的日常活动是什么?
6) 什么是助动词
1.协助主要动词构成谓语动词词组的词叫助动词(Auxiliary Verb).被协助的动词称作主要动词(Main Verb).助动词自身没有词义,不可单独使用.例如:
  He doesn't like English. 他不喜欢英语.
   (doesn't是助动词,无词义;like是主要动词,有词义)
2.助动词协助主要动词完成以下功用,可以用来:
   a. 表示时态,例如:
    He is singing. 他在唱歌.
     He has got married. 他已结婚.
   b. 表示语态,例如:
    He was sent to England. 他被派往英国.
   c. 构成疑问句,例如:
    Do you like college life? 你喜欢大学生活吗?
     Did you study English before you came here?你来这儿之前学过英语吗?
d. 与否定副词not合用,构成否定句,例如:
   I don't like him.  我不喜欢他.
e. 加强语气,例如:
   Do come to the party tomorrow evening. 明天晚上一定来参加晚会.
   He did know that.  他的确知道那件事.
3.最常用的助动词有:be, have, do, shall, will, should, would
7) forget doing/to do与remember doing/to do
1.forget to do忘记要去做某事(未做);forget doing忘记做过某事(已做)
 The light in the office is still on. He forgot to turn it off.
   办公室的灯还在亮着,它忘记关了.(没有做关灯的动作)
   He forgot turning the light off.
   他忘记他已经关了灯了. ( 已做过关灯的动作)
   Don't forget to come tomorrow.
   别忘了明天来.    (to come动作未做)
  典型例题
   ---- The light in the office is still on.
   ---- Oh,I forgot___.          
     A. turning it off  B. turn it off 
   C. to turn it off  D. having turned it off
  答案:C.由the light is still on 可知灯亮着,即关灯的动作没有发生,因此用forget to do sth.而forget doing sth 表示灯已经关上了,而自己忘记了这一事实.此处不符合题意.
2.remember to do记得去做某事(未做);
remember doing记得做过某事(已做)
   Remember to go to the post office after school.记着放学后去趟邮局.
Don't you remember seeing the man before? 你不记得以前见过那个人吗?
8) It's for sb.和 It's of sb.
1.for sb. 常用于表示事物的特征特点,表示客观形式的形容词,如:
easy, hard,difficult,interesting,impossible等:
  It's very hard for him to study two languages. 对他来说学两门外语是很难的.
2.of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词.如:
good, kind, nice, clever, foolish, right.
   It's very nice of you to help me. 你来帮助我,你真是太好了.
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