初三英语4、5单元

1. if 引导的非真实性条件状语从句 即 虚拟语气 通过动词形式的变化来表示说话人对发生的动作或存在的状态所持的态度或看法的动词形式称为语气，虚拟语气表示说话人所说的话不是事实，而是一种祝愿，建议或是与事实相反的假设等。 If 引导的条件状语从句分为真实和非真实条件句，非真实条件句应用虚拟语气。如果要表示与现在或将来事实相反时，其虚拟语气结构为：句 型条件从句主 句谓语动词形式动词过去式(be动词用were)would+动词原形 即：(从句)if +主语+动词过去式(be 动词用were), 一般过去时(主句) 主语+would+动词原形 过去将来时 如：If I had time, I would go for a walk.如果我有时间，我就会去散步。(事实上我现在没有时间) If I were you, I would take an umbrella. 假如我是你的话，我会带上雨伞。(事实上我不是你)I would say no if someone asked me to be in a movie. 假如有人请我当电影演员，我会表示拒绝。(事实上瑞没有人请我当电影演员)2. pretend to do sth. 假装做某事 I pretended to sleep just now. pretend +从句 假装 I pretended that I fell asleep. 3. be late for 迟到 如： I am late for work/ school/ class/ party.4. a few 与 a little 的区别，few 与 little 的区别 a few 一些 修饰可数名词 a little 一些 修饰不可数名词 两者表肯定意义 如：He has a few friends. 他有一些朋友。 There is a little sugar in the bottle. 在瓶子里有一些糖。 few 少数的 修饰可数名词 little 少数的修饰不可数名词 但两者表否定意义 如：He has few friends. 他没有几个朋友。 There is little sugar in the bottle.在瓶子里没有多少糖。5. still 仍然,还 用在be动词之后，行为动词之前 如： I am still a student.我仍然是个学生 I still love him.我仍然爱他。6. hundred, thousand , million, billion (十亿)词前面有数词或several 一词时要不能加s ，反之，则要加s 并与of 连用， 表示数量很多 如：several hundred/ thousand/ million/ billion people 几百/千/百万/十亿人 hundreds of trees 上百棵树7. what if + 从句 如果怎么办 ， 要是 又怎么样 如： What if she doesnt come? 要是她不来怎么办？ What if LiLei knows? 如果李雷知道了怎么办？8. add sth. to sth. 添加到 如： I added some sugar to water. 我把糖添加到水里。9. 系动词与形容词连用 get nervous 变得紧张 feel shy 觉得害羞 look friendly 看起来友好10. too +形/副+to do sth. 太而不能 如： Im too tired to stand. 我太累了而不能站。11. help with sth. 如：They help with this problem. help sb. do. 如：They help you relax. 他们帮助你放松12. in public 在公共场所 如:Dont smoke in public. 请不要在公共场所吸烟。13. energetic adj. 活力的 如：She is a energetic girl. 她是一个活力的女孩。 energy n. 活力 如：She has lots of energies. 她有活力。14. ask sb. to do 叫做某事 ask sb. not to do sth.叫不要做某事 tell sb. to do 告诉做某事 tell sb. not to do sth. 告诉不要做某事如：Teacher asked me to clean the classroom. Teacher asked me not to clean the classroom.15. start doing = start to do. 开始做某事 如： He started speaking/ to speak. 他开始说话。16. borrow sth. from sb. 从某人那里借来某物 如： I borrowed a book from Lily. 我从莉莉那里借来一本书。17.wait for sb.等某人 如：I am wait for him. 我正在等他。18. introduce sb. to sb. 把某人介绍给某人 如： I introduced Lily to Anna. 我把莉莉介绍给安娜。19. invite sb. to do 邀请某人做某事 如： Lily invited me to go to her home for supper. 莉莉邀请我去她家吃晚饭。20. have dinner/ supper 吃晚饭have lunch/ breakfast 吃午餐、吃早餐21. plenty of 修饰不可数名词，也可以修饰可数名词 许多 如： They have plenty of food/ apples. 他们有许多的食物/苹果。22. 给某人某物 give sth. to sb. 如： give an apple to me give sb. sth. give me an apple 给我一个苹果23. get along with sb. 与相处 如： Do you get along well with your friends? 你和你的朋友相处得好吗？24. would rather do sth. than do sth. 表示愿做某事而不愿做某事 如： I would rather walk than run. 25. whole 整个 26. in fact 事实上27. let sb. down 让某人失望 如： Dont let your mother down. 不要让你的妈妈失望。28. come up with sth. 提出 想出 如： He came up with a good idea. 他提出了一个好主意。 catch up with sb. 追上 赶上 如： Lily caught up with Anna. 莉莉赶上了安娜。29. have experience doing 在做某事有经验 如： I have experience teaching Chinese. 我在教英语方面有经验。30. come out 出版，出来 如： The magazine comes out once a week. 这种杂志每周出版一次。31. by accident 偶然地，无意之中 如：Last week I cut my finger by accident. 上个星期我不小心割到自己的手指。32. hurry to do 匆忙 I hurry to call the police.33. more than 超过34. offer sb. sth. 给某人提供某物宾语从句 宾语从句在复合句中作主句的宾语。 由连接词+ 主语+ 谓语构成 常由下面的一些词引导： 由that 引导 表示陈述意义 that 可省略 He says (that) he is at home. 他说他在家里。 由if , whether 引导 表示 一般疑问意义(带有是否、已否、对否等) I dont know if / whether Wei Hua likes fish. 我不知道韦华是否喜欢鱼。 由 连接代词、连接副词(疑问词) 引导 表示特殊疑问意义 Do you know what he wants to buy? 你知道他想要买什么吗？ 从句时态要与主句一致 当主句是一般现在时，从句根据情况使用任何时态 He says (that ) he is at home. 他说他在家里。 I dont know (that) she is singing now. 我不知道她正在唱歌。 She wants to know if I have finished my homework. 她想要知道我是否已经完成了我的作业。 Do you know when he will be back? 你知道他将会什么时候回来？ 当主句是一般过去时，从句应使用过去某时态(一般过去时,过去进行时，过去将来时，过去完成时) He said (that) he was at home. 他说他在家里。 I didnt know that she was singing now. 我不知道她正在唱歌。She wanted to know if I had finished m homework. 她想要知道我是否已经完成了我的作业。Did you know when he would be back? 你知道他将会什么时候回来？( ) 1. I a big house for my family if I a lot of money.A. would buy; have B. would buy; had C. will buy; had D. will buy; will have( ) 2. If I you, I the job.A. am; will take B. was; would take C. were; would take D. are; will take( ) 3. Without electricity human life quite different today.A. is B. will be C. would have been D. would be( ) 4. Ill be back before Christmas.I wish you back before Thanksgiving.A. come B. would come C. will come D. came( ) 5. The number 2,340,000 is read as .A. two million three hundred and forty thousandB. two millions three hundreds and forty thousandC. two millions three hundreds forty thousandD. two millions three hundreds forty thousands( ) 6. I dont know if I anyone at the party this evening. If I anyone, I will get nervous.A. will know; wont know B. will know; dont knowC. know; wont know D. know; dont know( ) 7. I dont know to do next.A. what B. how C.where D. why( ) 8. If someone get into , we should help him.A. terrible B. trouble C. an argument D. habits( ) 9.I think they are hardly tired, _?A. arent they B. are they C. dont I D. do I( ) 10. You didnt embarrass me .A. in slight B. in the slight C. in the slightest D. at the slightest情态动词用法归纳 情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力（体力、知识、技能）。 Can you lift this heavy box?（体力） Mary can speak three languages.（知识） Can you skate?（技能） 此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。 Ill not be able to come this afternoon. 当表示“经过努力才得以做成功某事”时应用be able to，不能用Can。如： He was able to go to the party yesterday evening in spite of the heavy rain. 2) 表示请求和允许。 -Can I go now? - Yes, you can. / No, you cant. 此时可与may互换。在疑问句中还可用could, might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。 - Could I come to see you tomorrow? - Yes, you can. ( No, Im afraid not. ) 3) 表示客观可能性（客观原因形成的能力）。 Theyve changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4) 表示推测（惊讶、怀疑、不相信的态度），用于疑问句、否定句和感叹句中。 Can this be true? This cant be done by him. How can this be true? 二、 may, might 1) 表示请求和允许。might比 may语气更委婉，而不是过去式。否定回答时可用cant 或mustnt，表示“不可以，禁止”。 -Might/ May I smoke in this room? - No, you mustnt. - May/Might I take this book out of the room? - Yes, you can. (No, you cant / mustnt. ) 用May I.？征徇对方许可时比较正式和客气，而用Can I.？在口语中更常见。 2）用于祈使句，表示祝愿。 May you succeed! 3) 表示推测、可能性（不用于疑问句）。 might不是过去式，它所表示的可能性比may小。 1He may /might be very busy now. 2Your mother may /might not know the truth. 三、 must, have to 1) 表示必须、必要。 You must come in time. 在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt, dont have to（不必）. - Must we hand in our exercise books today? - Yes, you must. - No, you dont have to / you neednt. 2) must是说话人的主观看法， 而have to则强调客观需要。Must只有一般现在时， have to 有更多的时态形式。 1 he play isnt interesting, I really must go now. 2 I had to work when I was your age. 3) 表示推测、可能性（只用于肯定的陈述句） 1 Youre Toms good friend, so you must know what he likes best. 2 Your mother must be waiting for you now. 四、 dare, need 1) dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。 1 How dare you say Im unfair? 2 He darent speak English before such a crowd, dare he? 3 If we dared not go there that day， we couldnt get the beautiful flowers. 2) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。 1You neednt come so early. 2. - Need I finish the work today? - Yes, you must. / No, you neednt. 3) dare和 need作实义动词用时， 有人称、时态和数的变化。在肯定句中，dare后面常接带to的不定式。在疑问句和否定句中，dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。 1. I dare to swim across this river. 2. He doesnt dare (to) answer. 3. He needs to finish his homework today. 五、 shall, should 1) shall 用于第一人称，征求对方的意见。 What shall we do this evening? 2) shall 用于第二、三人称，表示说话人给对方的命令、警告、允诺或威胁。 1. You shall fail if you dont work hard.(警告) 2. He shall have the book when I finish it.(允诺) 3. He shall be punished.(威胁) 六、 will, would 1) 表示请求、建议等，would更委婉。 Will / Would you pass me the ball, please? 2) 表示意志、愿望和决心。 1. I will never do that again. 2. They asked him if he would go abroad. 3) would表示过去反复发生的动作或某种倾向。would表示过去习惯时比used to正式，且没有“现已无此习惯”的含义。 1. During the vacation, he would visit me every other day. 2. The wound would not heal. 4) 表示估计和猜想。 It would be about ten oclock when she left home. 七、 should, ought to 1) should, ought to表示“应该”，ought to表示义务或责任，比should语气重。 1. I should help her because she is in trouble. 2. You ought to take care of the baby. 2) 表示劝告、建议和命令。should, ought to可通用，但在疑问句中常用should。 1. You should / ought to go to class right away. 2. Should I open the window? 3) 表示推测 should , ought to (客观推测), must(主观推测)。 1.He must be home by now. (断定他已到家) 2.He ought to/should be home by now.(不太肯定) 3. This is where the oil must be.(直爽) 4. This is where the oil ought to/should be.(含蓄)1. - Can you swim in the river?- No, I _.A. mustnt B. may not C. cant D. neednt2. - ay I go swimming now? - No, you _. You must finish your homework first.A. mustnt B. may not C. couldnt D. neednt3. - Excuse me. Where is the zoo?- Sorry, I dont know. Ask that policeman. He _ know.A. shall B. may C. need D. would4.- _ I finish the work today?- No, you neednt.A. Must B. May C. Can D. Need5. - Must I finish my homework now?- No, you _. You may have a rest first.A. mustnt B. cant C. may not D. neednt6. - Tom, where is your father?- Im not sure. He_ in his office.A. is B. may be C. maybe D. may7. -_I visit Lucy on Sunday, Mum? -Yes, you_.A. Must；can B. May；may C. Need；need D. May；need8. - Where is Tom? - He hasnt come to school today. I think he_ be ill.A. has to B. should C. may D. need9. - Can you fly a kite? - No, I _.A. mustnt B. neednt C. cant D. couldnt10. This book _ Lucys. Look! Her name is on the book cover.A. must be B. may be C. cant be D. mustnt be11The book is on Lilys desk. _it is hers. A, Maybe B. May be C .Can D .Might12. The notebook must _ Li Nings. A. belong B. be C. belong to13. This pair of shoes _ Deng Huas . Theyre too big for her.A. might beB. cant beC. must be14. .Its so cold and youve walked a long way. You _be tired. Have a rest. please. A .cant B. might C .must .C. can15.Must I come to see you again? No,you .A、mustnt B、neednt C、cant D、may not16.-Is Mr Hu in the reading room?-No,he _be there. He has gone to Tianjin.A. mustnt B. neednt C. wont D. cant17. -Whose book is this? It _ be Lusys. Her name is on it. A .could B. cant C. must D. might18. Who does this pencil case belong _?It must be Celias.A. to B. in C. on D. of19.Can you swim in the river? - No, I _.A. mustnt B.may not C. cant D. neednt20. Dad! Must I finish my homework first? -No, you_. You can do it after supper. A. mustnt B. neednt C. cant D. couldnt21. There is an old saying. The cleverest housewife _cook a meal without rice.A. may B. mustntC. neednt D. cant22. -May I put my bike here? No, you _.A. mustnt B. couldntC. neednt D. wont23. Its a fine day, you _take an umbrella with you. A. cant B. mustnt C. shouldnt D. neednt 24.This question is _ easy, all the students can answer it. A. too much B. too many C. much too D. many too25. -Whose T-shirt is this? -It _ be Johns. Its too small for him.A. must B. might C. cant D mustnt 26. Its too late, I _go home now, or my parents will be angry with me.A,have to B. have C. may D. can27. Do you know who the pen_?” Sorry ,I dont know.A. belong B .belong to B. belongs to D. belongs 28. The football cant be Lilys because she doesnt like it. She likes playing guitar. A. a B. the C. an D. /29.Whose guitar is this? (改为同义句) _ _ the guitar belong to?30 Bing Xin is a famous_(作家)。31. Taiwan （属于）to China forever.32. Tomorrow well go for a _（野餐）in the country if it doesnt rain.