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help的过去式

初一作文 时间:2010-05-03

【www.jinghuajt.com--初一作文】

help的过去式一:初一英语语法上册要点


  英语语法基础对英语水平的提升具有重要作用,良好的语法基础能提升阅读写作等能力。下面是小编为大家整理的初一英语语法上册要点的相关资料,仅供大家参考。
  初一英语语法上册要点
  look-look at,look after,look like,look for,look up,look out,look through. read,see,watch,read的区别。
  answer-the answer to the question
  take-take,bring,carry,get的区别
  sound-sound,voice,noise的区别
  lots of=a lot of
  piay soccer
  one作代词复数ones
  help-help sb (to) do/with sth.help oneself to
  too to=not enough to
  find-find sth adj ,find sb doing,find 从句
  tell-tell sb sth=tell sth to sb,tell sb to do sth
  want-want=would like,want to do sth want sb not to do sth
  a little-+uncountable noun,a few,a little句子表肯定,little few表否定,f修可数,l修不可数
  how much-提问钱数,与how many区别
  buy-过去式bought,buy sth for sb,buy sth from
  when-提问时间,when be 句子
  what-what adj uncountable noun感叹句
  初一英语语法下册要点
  across-go across,through内部穿过,across表面穿过
  arrive-+in 大地方,+at小地方,后不加宾语
  other-some... others...,可用于adj
  talk-talk to sb/talk with sb,talk about sth
  lie-躺过去式lay,过去分词lain,撒谎,过去式lied,过去分词lied
  there be-there will be=there is going to be。there be后多个名词取就近原则,反义疑问句仍用there
  enjoy-doing
  pay-pay for
  how is the weather?=what’s the weather like?
  stop-stop doing停止做的事,stop to do停下来去做某事
  spend-spend sb sometime doing sth
  make-make sb do sth
  decide-decide to do
  mind-change one’s mind,doing
  remember-to do记得去做某事,doing记得做过某事
  practice-doing
  would like-回答yes,i would like to
  agree-with sb,反义词组disagree with
  what...... look like?外貌what be like?性格what...like?喜欢什么how...like...?怎么样
  I don’t think he’s...我认为他不......,反义疑问句is he?
为您推荐:
1.初一英语语法习题答案
2.七年级初一上册英语期中考试试卷质量分析
3.英语语法:改句子
4.完成句子的解题技巧
5.初三英语复习备考方案
6.英语句子结构

help的过去式二:七年级英语总复习资料参考

  Unit 1 Where’s your pen pal from?
  一、词组
  be from= come form 来自...
  pen pal=pen friend 笔友
  like and dislike 好恶;爱憎
  live in….在...居住
  speak English 讲英语
  play sports 做体育运动
  a little French 一些法语
  go to the movies 去看电影
  an action movie 一部动作片
  on weekends 在周末
  Excuse me 对不起,打扰
  get to 到达、抵达
  beginning of 在...开始的时候
  at the end of 在...结束的时候
  arrive at /
  二、句型
  (1)、Where主 +be+主语+from?
  主语+be+from+地点.
  (2)、Where do/does+主语+live?
  主语+live/lives in…
  (3)、What language do/does +主语+speak?
  主语+speak/speaks….
  (4)、主语+like/likes+doing…
  三、日常交际用语
  1-Where is your pen pal from?
  -He’s from China.
  2-Where does she live?
  --She lives in Tokyo.
  3-Does she speak English?
  -Yes,she does/No,she dosen’t.
  4-Is that your new pen pal?
  -Yes,he is /No,he isn’t.
  5-What language does she speak?
  -She speaks English.
  Unit 2 Where’s the post office
  一、词组
  post office 邮局
  pay phone 投币式公用电话
  next to 在...隔壁
  across from 在...对面
  in front of 在...前面
  between…and… 在...和...之间
  on a street 在街上
  in the neighborhood 在附近
  on the right/left 在右边/在左边
  on one’s right/left 在某人的右边/左边
  turn right/left 向右/左转
  take a walk 散步
  have fun 玩得开心
  the way to …去...的路
  take a taxi 打的/乘出租车
  go down(along)…沿着...走
  go through...穿过..
  have a good trip 旅途愉快
  二、句型
  (1)、Is there a bank near here?
  Yes,there is .It’s on Centre Street.
  No,there isn’t.
  (2)、Where’s the sumpermarket?
  It’s next to the library.
  (3)、Bridge Street is a good place to have fun.
  (4)、I hope you have a good trip.
  (5)、If you are hungry,you can buy food in the restaurant.
  (6)、Talk a walk though the park..
  (7)、enjoy后接名词或动词-ing形式.
  Do you enoy(=like) your work?
  Do you enjoy(=like) living in the city?
  三、日常交际用语
  (1)、Is there a ….?句型Eg:
  -Excuse me.Is there a hotel in the neighborhood.
  -Yes, there is. No.there isn’t
  (2)、Where is …?句型Eg:
  -Where is the park,please?
  -It’s behind the bank.(肯定回答)
  -I’m sorry I don’t know. (否定回答)
  (3)、Which is the way to +地点? 句型.例如:
  - Which is the way to the library.
  (4)、How can I get to +地点?句型.例如:
  -How can I get to the restaurant?
  (5)、Can you tell me the way to +地点?句型.例
  - Can you tell me the way to the post office?
  (6)、Let me tell you the way to my house.
  (7)、Just go straight and turn left.
  Unit 3 Why do you like koalas?
  一、词组
  want to do sth .想要做某事
  want sb to do sth 想要某做某事
  want sth 想要某物
  Let sb do sth 让某人做某事
  kind of 有几分种类
  a kind of 一种…
  …years old …年龄 如:ten years old 十岁
  like to do sth 喜欢做某事
  like doing sth
  play with … 与...一起玩
  be quiet 安静
  during the day 在白天
  at night 在夜间
  have a look at.. 看...
  one…the other 一个...另一个...
  二、句型
  (1)、-why do you like pandas?
  -Because they’re very cure.
  (2)、-Why dose he like koalas?
  -Because they are kind of interesting.
  (3)、-Where are lions from?
  -Lions are from South Africa.
  (4)、-What animals do you like?
  -I like elephants.
  三、日常交际用语
  (1)、-Let’s see the lions.
  (2)-Why do you want to see the lions?
  -Becase they are very cute.
  (3)-Do you like giraffes?
  Yes,I do./ No,I don’t
  (4)-What other animal do you like?
  _I like dogs.too
  other+ 名词的复数.表示没有特定的数量范围
  the other+名词的复数表示有特定的数量范围.
  (5)-Why are you looking at me?
  -Because you are very cute.
  (6)-Let us play games. CGreat!
  Let me see.
  Unit 4 I want to be an actor.
  一、词组
  want to be+职业 想要成为。。。
  shop assistant 店员
  bank clerk 银行职员
  work with 与。。。一起工作
  work hard 努力工作
  work for 为。。。而工作
  work as 作为。。而工作
  get.. from…从。。。获得。。。
  give sth.to.sb /give.sb.sth 把某物给某人
  正确的表示:give it/them to sb.
  错误的表示:give sb.it/them
  in the day 在白天
  at night 在夜间
  talk to /with 与…讲话
  go out to dinners 外出吃饭
  in a hospital 在医院
  newspaper reporter 报社记者
  movie actor 电影演员
  二、句型
  (1)-What do/does+某人+do?
  例:-What do you do?-I’m a student.
  -What dose he do? He’s a teacher.
  (2)-What do/does+某人+want to be?
  例:What do you want to be?-I want to be a teacher.
  -What does she want to be ?She want to be a nuser.
  (3)-Where does your sister work?
  -She works in a hospital.
  (4)-Does he work in the hospiat
  Yes.he does/No,he doesn’t
  (5)-Does she work late?
  -Yes,she does/No.she doesn’t
  (6)-英语中询问职业的几种表达方式:
  What do/does …do?
  What is…? What is your father?
  What’s one’s job?例:What’s your father’s job?
  Unit 5 I’m watching TV.
  一、词组
  do homework 做家庭作业
  watch TV 看电视
  eat dinner 吃饭;就餐
  clean the room 打扫房间
  read newspaper/a book 看报纸/看书
  go to the movies 看电影
  write a letter 写信
  wait for 等待;等候
  talk about 谈论。。。。
  play basketball/soccer/ 打篮球/踢足球
  take photos 拍照
  TV show 电视节目
  Some of……中的一些
  a photo of my family 我的家庭照
  at school 在学校
  be with 和。。。一起
  in the tree 在树上
  二、句型
  (1)-What+be+主语+doing? ….正在做什么?
  -主语+be+doing…… …正在做某事。
  例: -what are you doing?
  -I’m doing my homework.
  (2)-Thanks for … 为。。。而感谢
  例:Thanks for your letter.
  (3)-Here are/is…
  例:Here are some of my photos.
  Here is a photo of my family.
  (4)-That sounds good.
  (5)-This TV show is boring.
  三、日常交际用语
  (1)-Do you want to go to the movices? CSure.
  (2)-When do you want to go? CLet’s go at seven.
  (3)-Where do people play basketball? CAt school.
  (4)-What’s he waiting for?-He’s waiting for a bus.
  (5)-What’s he reading? He’s reading a newspaper.
  1)现在在进行时的形式是:
  助动词be(am,is,are)+动词-ing形式(也叫现在分词),表示现在(说话的瞬间)正在进行或发生的动作。
  2)现在进行时的肯定句形式
  主语+be(am,is,are)+动词现在分词+其他
  I’m watching TV.
  3)现在进行时的否定句形式
  主语+be(am,is,are)+not+动词现在分词+其他
  They are not playing soccer.
  4)现在进行时的一般疑问句形式及回答:
  Is(am,are)+主语+动词现在分词+其他?
  Yes,主语+is/am/are. No,主语+isn’t/aren’t/am not.
  Are you reading? Yes,I am. No,I am not.
  5) 现在进行时的特殊疑问句形式:
  特殊疑问词+is/am/are+主语+现在分词+其他?
  例:What is your brother doing?
  6) 动词+ing形式(现在分词)的构成.
  1一般情况下在动词词结尾加-ing.
  如: eat--eating, do?doing,clean?cleaning,
  play?playing,
  2以不发音的元音字母e结尾的动词,先去掉e再加-ing.
  如:take--taking,write?writing,have-having
  come?coming.dance--dancing
  3词尾如果是以一个辅音字母结尾的重读闭音节词.应该先双写这个辅音字母,再加-ing.
  如:run?runing,sit?sitting ,swim?swimming.
  Shop?shopping.put?putting,sit?sitting
  Unit 6 It’s raning!
  一、词组
  Around The World 世界各地
  On vacation 度假
  Take photos 拍照
  On the beach 在海边
  a group of people 一群人
  play beach volleyball 打沙滩排球
  be surprised 惊讶的
  be surprised at sth./sb.对某人或某人感到惊讶
  in this heat 在酷暑中
  be relaxed 放松
  have a good time 玩得很痛快
  in different kind of weather 在不同的天气里
  Thank sb for(doing)sth由于(做)某事而感谢某人
  How’s it going? 近况如何
  Some…others…一些…另一些…
  Look like..看起来像……
  二、句型/日常交际用语
  (1)-How’s the weather(+地点)? CIt’s raining?
  (2)-What’s the weather like??It’s sunny./It’s cold and snowing.
  (3)-How’s it going? CGreat./Not bad.
  (4)Thanks you for joining CCTV’s Around The World show?
  (5)-Is Aunt Wang there? CYes,she is/No,she isn’t
  Unit 7 What dose he look like?
  一、词组
  look like 看起来像....
  curly /short/straight/long hair 卷/短/直发
  medium height/build 中等高度/身体
  a little bit 一点儿…
  a pop singer 一位流行歌手
  play的用法。
  wear glasses 戴眼镜
  have a new look 呈现新面貌
  go shopping 去购物
  the captain of the basketball team 篮球队队长
  Nobody knows me 没有人认识我
  二、句型
  1) --What does he look like?
  --He’s really short.He has short hair.
  2) --She has beautiful,long black hair.
  3) --I don’t think he’s so great .
  4) --What do you look like? I’m tall.I’m thin.
  5) --What do they look like?-
  --They are medium height.
  6) --She never stops talking.
  --Stop doing(sth)表示停止正在干的事.
  如:He stop listening
  --stop to do (sth)表示停下来去做某事
  如:He stops to listen.
  7)I can go shopping and nobody knows me.
  Unit 8 I’d like some noodles.
  1.词组
  would like 想要
  a large/medium/small bowl 大碗/中碗/小碗
  what size 什么尺寸
  orange juice 桔汁
  green tea 绿茶
  phone number 电话号码
  as well as 而且
  what kind of 表示….的种类
  a kind of 一种…
  some kind of 许多种…
  a bowl of rice 一碗米饭
  a bottle fo orange juice 一瓶桔子汁
  three oranges 三个桔子(可数)
  a bottle fo orange j 一瓶桔子汁(不可数)
  some chicken 一些鸡肉(不可数)
  three chicken 三只小鸡(可数)
  二句型
  1)What kind of … would you like? 你想要…?
  EG:--What kind of noodles would you like?
  --Beef and tomato noodles.please.
  2)We have lare ,medium,and small bowls.
  3)I like dumplings,I don’t lkee noodles.
  三日常交际用语
  (1)?Can I help you?
  --I’d like some noodles.please.
  (2)--what kind of noodles would you like?
  --I’d like mutton and potato noodles. Please.
  ( 3)?Would you like a cup fo green tea?
  --Yes,please./No,thanks
  would like后面还可以跟不定式.即:
  A:would like to do.sth.想要做某事.
  He would like to see you today.
  B:would like sb.to.do.sth.想要某人做某事
  What would you like me to do.
  Unit 9 How was yu weekend?
  一、词组
  do one’s homework 做某人的家庭作业
  如:do my homework 做我的家庭作业
  play +运动或棋类
  如:play soccer 踢足球 play chess 下棋
  play +乐器 如:play the guitar 弹吉他
  go to the movies 去看电影
  do some reading 阅读
  study for the (math) test 准备(数学)考试
  stay at home 呆家里
  go to summer camp 去夏令营
  go to the mountains 去爬山
  visit sb 拜访某人
  go shopping 去购物
  last month 上个月
  three days ago 三天前
  yesterday 昨天
  look for 寻找
  go for a walk 散步
  in the morning/afternoon/evening 在早上/在下午/在晚上
  play computer games 玩电脑游戏
  It was time to sth 该……的时候了
  二、句型
  (1)I visited my aunt last weekend.
  (2)-- How was your weekend?
  --It was great./OK
  (3)?It was time to go home.
  三、日常交际用语
  (1)?What did you do last weekend?
  --On Saturday morning,I played teenis.
  (2)?How was your weekend?
  --It was great.I went to the brach.
  一般过去时态
  一般过去时态表示过去发生的动作或存在的状态,动词通常用一般过去式来表示,除动词be的过去式was/were有人称变化,其他都没人称的变化。
  过去式的构成
  (1) 一般情况下在动词词尾加-ed.如:
  stay?stayed help?helped visit-visited
  (2) 词尾是e的动词加-d.
  如:like?liked live?lived
  (3) 以一个元音字母加一个辅音结尾的重读闭章节应双写该辅音字母,再加-ed.如:
  stop?stopped plan?planned
  (4) 以辅音字母+y结尾的动词,要将y改为i再加-ed.如: study?studied worry?worried
  (5) 不规则动词的过去
  am/is?was are?were have-had
  go?went find?found do?did see-saw
  Unit 10 Where did you go on vacation?
  一、词组
  ptetty good 相当好;不错
  in the conner 在角落
  kind of boring 有点无聊
  be lost 迷路
  feel happy 感到高兴
  be fun 很有趣
  on vacation 在度假
  Central Park 中央公园
  the Great Wall 长城
  the Palace Museum 故宫
  Tian’an Men Square 天安门广场
  二、句型
  (1)?Where did you go on vacation?
  --I went to the breach.
  (2)?How was the weather?
  --It was hot and humid.
  (3)--It was kind of boring
  (4)?That made me feel very happy.
  (5)--We had great fun playing in the water.
  --have great fun doing sth表示“愉快地做某事”,“做某事很有趣”
  (6)I helped him find his father.That made me feel very happy.
  help sb.(to)do.sth.帮助某人做某事(to可省)
  make sb.do.sth. 使某人做某事
  let sb.do.sth.
  Let me help you carry(搬动) it.
  (7)I found a small boy crying in the conner.
  find sb.doing sth.发现某人正在做某事。
  find sb.do.sth.发现某人做某事(整个过程)
  Unit 11 What do you think of game shows?
  一、词组
  talk show 谈话节目
  soap opera 肥皂剧
  sports show 体育节目
  game show 比赛节目
  think of 认为
  how about… …怎么样?=what about…
  in fact 事实上
  a thirteen-year-old boy 一个十三岁的男孩= The boy is thirteen years old
  talk to(with)… 跟 …谈话
  thanks for… 为…感谢
  each student 每个学生
  key ring 钥匙链
  baseball cap 棒球帽
  the school magazine 校刊
  can’t stand 不能忍受
  don’t mind 不介意/无所谓/不在乎
  二、句型
  (1)?What do you think of situation comedy?
  -- I love them
  (2)?I asked students about fashion.
  (3)?This is what I think.
  (4)--I don’t mind what young people think of me!
  (5)?Can you please put my letter in next month’s magazine?
  三、日常交际用语
  (1)?What do you think of suop operas?
  --- I love them/I don’t mind them/I can’t stand them/I don’t like.
  (2)?How about you? ---I do.too.
  (3)--What do you think of …?
  --=How do you like…?
  如:What do you think of the picture?
  =How do you like the picture?
  Unit 12 Don’t eat in class.
  一、词组
  school rules 学校规章制度
  break the rules 违反规章制度
  in the hallways 在过道
  listen to music 听音乐
  in the music room 在音乐教室里
  in the dining hall 在餐厅
  sports shoes 运动鞋
  gym class 体育课
  after school 放学后
  have to do 不得不做
  too many 太多
  get up 起床
  by ten o’clock 十点之前
  make dinner 做饭
  the children’s palace 少年宫
  二、句型
  (1)?Don’t arrive late for class.
  (2)?We can’t listen to music in the hallways,but we can listen to it outside.
  (3)?What else do you have to do?
  -- We have to clean the classroom.
  (4)--Can we wear hats in school?
  --Yes,we can/ No,we can’t.
  (5)-Do you have to wear a uniform at school?
  -Yes,we do /No,we don’t.
  重难点精析
  祈使句
  通常用来表示命令、请求、禁止、建议、警告等语气。它的主语you(听话人)通常省略。其构成通常有以下几种形式。
  1)Be型(即系动词原型be+表语+其他)。
  如:Be quiet,please.
  否定句Don’t + be+表语+其他。
  如:Don’t be angry.
  2)Do型(即系动词原形+宾语+其他)。如:
  Open you books,please.
  否定句Don’t +实义动词原形+宾语+其他。
  如:Don’t eat in the classroom.
  3)Let型(即Let+宾语+动词原形+其他)如:
  Let me help you.
  Let’s go at six o’clock.
  否定句一般在宾语后加not。如:
  Let’ not watch TV.
  4)No+V-ing型(此种形式通常用于公共场合的提示语中,意为“禁止做某事“)如:
  No smoking! 严禁吸烟!
  No talking! 不许交谈!
  No passing! 禁止通行!
  No parking! 不许停车

help的过去式三:初一英语复习知识要点归纳


  英语的学习是一个长期积累的过程,初一的英语学习一定要一步一步来,要将学过的单词、句子和语法知识点都巩固好。下面是百分网小编为大家整理的初一英语重要的知识总结,希望对大家有用!
  初一英语重点知识
  一般现在时
  一般现在时表示经常性或习惯性的动作,或表示现在的特征或状态。
  其动词形式是:动词原形(只有第三人称单数作主语时除外,要加-s)其疑问句和否定句需要用助动词do或does
  1) 肯定句用行为动词原形表示
  They get up very early every morning. 他们每天早晨起来很早。
  I visit my grandparents four times a month. 我一个月去看望祖父母四次。
  2) 否定句用don’t + 动词原形来表示
  We do not go shopping on Sundays. 我们周日不去购物。
  I don’t think you like this colour. 我想你不喜欢这个颜色。
  3) 一般疑问句则是把助动词do提前至句首,后面动词用原形。回答时,肯定用 “Yes, 主语+do”;否定句用 “No, 主语+don’t”。
  ?Do they go to school at seven o’clock? 他们七点去上学吗?
  --Yes, they do.
  --Do you like this skirt? 你喜欢这条裙子吗?
  --No, I don’t. 不,我不喜欢。
  一般现在时用来表示经常的或习惯性的动作,常与以下的时间状语连用:often 经常,always 总是,sometimes 有时,usually 通常,every day/ week 每天/ 周等。
  He usually goes to school by bike. 通常他骑车上学。
  I visit my grandparents every week. 我每个星期都去看祖父母。
  She is always late for class. 她总是上课迟到。
  My parents and I sometimes go out to eat. 我和父母有时出去吃饭。
  It often rains here. 这儿常常下雨。
  初一英语知识要点
  (1)speak的用法
  speak与say不同:speak表示"说"的动作,不表示"说"的内容;say则表示"说"的内容。
  speak后面除了能接"语言"外,不能直接接东西,后面加了to则表示"对......说"。
  help sb. with sth.(帮助某人做/补习......)
  want to do sth.(想要做某事)
  would like to do sth.
  not...at all(一点都不);Not at all.(没关系/别介意)
  like...a lot = like...very much
  (2)some和any的区别:
  口诀:some用于肯定句,否定、疑问变any。例如:
  I have some money.
  I don"t have any money.
  Do you have any money?
  (3)have a seat = take a seat(请随便坐)
  (4)祈使句(表示命令或请求的句子)
  祈使句一般都省略了主语You,所以其否定句直接用Don"t开头。例如:
  Don"t go there!
  (5)问职业:
  What does sb. do?
  What is sb.?
  What"s sb."s job?
  (6)work与job的区别:
  work是未必有报酬的"工作",例如homework, housework;而job则一定是有报酬的"工作"。
  (7)on指在物体的表面,不论这个面是否水平的,例如:
  on the desk/ wall/ farm/ playground
  (8)in hospital(住院);in the hospital(在医院里)
  look after(照料/照顾/照看)
  help oneself(请自便/随便吃)
  (9)表示"建议"的句型:"做某事如何?"
  What about (doing) sth.? (英式英语)
  How about (doing) sth.? (美式英语)
  Why don"t you do sth.? = Why not do sth.?
  (10)"吃"一日三餐要用have:have breakfast/ lunch/ supper
  have...for breakfast/ lunch/ supper
  take one"s order
  be kind to sb.
  (11)try on这个词组可合可分:名词可以放在这个词组的中间或后面,但代词只能放在词组的中间。
  (12)在口语中往往用take表示"买"。
  (13)how many与how much的区别:
  how many + 可数名词;how much + 不可数名词
  (14)What do you think of...? 是询问对方对某事物的看法;
  How do you like...? 是问对方对某事物喜欢的程度。
  think about(考虑)
  Thank you all the same. (即使对方没能帮上忙,也要礼貌道谢)
  Thanks. = Thank you.(thank作为动词,不能单独使用。)
  初一英语必背知识
  can/ could的用法
  (1) can表示体力和脑力方面的能力,或根据客观条件能做某种动作的"能力 "。例如:
  Can you ride a bike? 你会骑自行车吗?
  What can I do for you? 要帮忙吗?
  Can you make a cake?你会做蛋糕吗?
  (2) can用在否定句和疑问句中时有时表示说话人的"怀疑""猜测"或不肯定。例如:
  Where can he be?他会在什么地方呢?
  Can the news be true?这个消息会是真的吗?
  It surely can"t be six o"clock already?不可能已经六点钟了吧?
  You can"t be hungry so soon,Tom,you"ve just had lunch.汤姆,你不可能饿得这么快,你刚吃过午饭。
  What can he mean?他会是什么意思?
  在日常会话中,can可代替may表示"允许",may比较正式。例如:
  You can come in any time.你随时都可以来。
  --- Can I use your pen?我能用你的钢笔吗?
  --- Of course,you can.当然可以。
  You can have my seat,I"m going now.我要走了,你坐我的座位吧。
  (3) could
  could 是 can的过去式,表示过去有过的能力和可能性(在否定和疑问句中)。例如:
  The doctor said he could help him.(能力)医生说他能帮助他。
  Lily could swim when she was four years old.(能力)
  当丽丽四岁的时候她就会游泳。
  At that time we thought the story could be true.(可能性)
  那时我们以为所说的可能是真的。
  could可代替can表示现在时间的动作,但语气较为婉转。例如:
  Could I speak to John,please?我能和约翰说话吗?
  Could you?在口语中表示请求对方做事。例如:
  Could you wait half an hour?请你等半个小时好吗?
  Could you please ring again at six?六点钟请你再打电话好吗?
  (4) can的形式
  只有现在式can和过去式could两种形式。能表示一般现在和一般过去两种时态,有时也能表示将来。所有其他时态(包括将来时)须用be able to加动词不定式来表示。例如:
  They have not been able to come to Beijing.
  他们没有能到北京来。

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