You_______ buy the TV guide for next week. I have already bought a copy. [ ]A. mustn'tB. needn't to C. don’t have toD. can’t-八年级英语
[db:作者] 2020-01-04 00:00:00 互联网
题文
You_______ buy the TV guide for next week. I have already bought a copy.
[ ]
A. mustn't B. needn't to C. don’t have to D. can’t
题型:单选题 难度:中档
答案
C
据专家权威分析,试题“You_______ buy the TV guide for next week. I have already b..”主要考查你对 情态动词 等考点的理解。关于这些考点的“档案”如下:
情态动词
考点名称:情态动词
情态动词: 是一种本身有一定的词义,表示说话人的情绪、态度或与语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。 无人称和数的变化,情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加 “not”。 个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气, 时态性不强,可用于过去,现在或将来。情态动词属非及物动词,故没有被动语态。 情态动词有四类: ①只做情态动词:must, can(could),may(might)…… ②可做情态动词又可做实义动词:need, dare ③具有情态动词特征:have(had, has) to, used to ④情态动词表猜测 注:mustn't代表强烈禁止 must表示主观,have to表示客观。 常用的有:can may could must have use .
情态动词特点: 情态动词无人称和数的变化,情态动词后面跟的动词须用原形,否定式构成是在情态动词后面加 "not"。 个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气,时态性不强,可用于过去,现在或将来。情态动词属非及物动词,故没有被动语态。 He could be here soon.他很快就来。 We can't carry the heavy box.我们搬不动那箱子。 I'm sorry I can't help you.对不起,我帮不上你。
基本助动词与情态助动词最主要的区别之一是: 基本助动词本身没有词义,而情态助动词则有自己的词义,能表示说话人对有关动作或状态的看法,或表示主观设想: What have you been doing since? (构成完成进行体,本身无词义) I am afraid I must be going. (一定要) You may have read some account of the matter. (或许已经)
除此之外,情态助动词还有如下词法和句法特征: 1) 除ought和used以外,其他情态动词后面只能接不带to的不定式。如果我们把ought to和used to看做是固定词组的话,那么,所有情态动词无一例外地只能接不带to的不定式: We used to grow beautiful roses.我们过去常常种这种漂亮的玫瑰花 I asked if he would come and repair my television set.我问他是否来修我的电视机 2) 情态助动词在限定动词词组总是位居第一: They need not have been punished so severely. 3) 情态助动词用于第三人称单数现在时的时候,没有词形变化,即其词尾无-s形式: She dare not say what she thinks. 4) 情态动词没有非限定形式,即没有不定式和分词形式,也没有相应的动名词: Still,she needn't have run away. 5)情态助动词的“时”的形式并不是时间区别的主要标志。在不少场合,情态助动词的现在时和过去时形式都可以表示现在、过去或将来时间: Would you mind very much if I ask you to do something? She told him he ought not to have done it. 6) 情态助动词之间是相互排斥的,即在一个限定动词词组中只能出现一个情态助动词,但有时却可以与have和be基本助动词连用: You should have washed the wound. Well,you shouldn't be reading a novel. 7)情态动词must一般疑问句否定回答用needn't Must I read books every day、 No,you needn't
常见情态动词用法: 1.can (could) 表示说话人能,可以,同意,准许,以及客观条件许可,could 为 can 的过去式。 2.Must 必须,应该,一定,准是,表示说话人认为有必要做某事,命令,要求别人做某事以及对事物的推测。 must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。 must + have + 过去分词,表示现在对过去事物的推测。 must 和 have to 的区别:must 表示说话人的主观思想,have to 表示客观需要。 3.need 是一个情态动词,他的用法完全和其他情态动词一样,但 need 还可当作实义动词使用,这时 need 就象其他动词一样,有第三人称,单复数, 后面加带 to 的动词等特性。 needn't + have + 过去分词 表示过去做了没必要做的事情。 4.dare 除用作情态动词外,更多的是当实义动词使用, 用法同实义动词一样,要考虑人称,单复数,时态等。 5.ought 应当,应该。后面跟带有 to 的动词不定式。 ought + to have done 句型。指过去动作,表示一件事情该做而未做。 ought not to have done 句型。表示一件不该做的事情却做了。 6.will (would)决心,愿望。 would 为 will 的过去式, will, would用于疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。 7.Shall、should 表示命令,警告,允诺,征求,劝告,建议,惊奇。 8.have to,不得不,必须,表示客观条件只能如此,而must 则表示主观思想。
情态动词功能: 助动词主要有两类:基本助动词和情态助动词。 基本助动词有三个:do,have和be; 情态助动词基本的有十四个:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to.had better 上述两类助动词的共同特征是,在协助主动词构成限定动词词组时,具有作用词的功能: 1) 构成否定式: He didn't go and neither did she. The meeting might not start until 5 o'clock. 2) 构成疑问式或附加疑问式: Must you leave right now? You have been learning French for 5 years, haven't you? 3) 构成修辞倒装: Nowhere can he obtain any information about his sister. Hardly had he arrived when she started complaining. 4) 代替限定动词词组: A: Who can solve this crossword puzzle? B: Tom can. A: Shall I write to him? B: Yes, do.
情态动词表推测的用法小结 (一)情态动词表推测的三种句式 1.在肯定句中一般用must (一定),may(可能),might /can, could(也许,或许)。 (1)He must/may/might know the answer to this question? 他一定/可能/也许知道这个问题的答案。 (2)It is cold in the room. They must have turned off the heating. 屋里很冷,他们肯定把暖气关了。 2. 否定句中用can’t / couldn’t(不可能), may not/might not (可能不)。 (1)It can’t/couldn’t be the headmaster. He has gone to America. 这不可能是校长,他去美国了。 (2)He may not/might not know the scientist. 他也许不认识那位科学家。 3. 疑问句中用can/could (能……?)。 (1)Could he have finished the task? 他可能把任务完成了吗? (2)Can he be at home now? 他现在能在家吗? 注:以上三种句式中情态动词的语气按程度都是依次递减的。Might, could并非may, can的过去式,而表示语气较为委婉或可能性较小。
(二)情态动词表推测的三种时态 1. 对将来情况的推测,用“情态动词 + 动词原形”。 (1)She must / may / might / could arrive before 5. 5: 00 前她一定/可能/也许到。 (2)She must/may/might/could walk miles and miles among the hills without meeting anyone. 她一定/可能/也许会在山里一连走好几英里而遇不到一个人。 2. 对现在或一般情况的推测,用“情态动词 + be”,“情态动词 +be doing”或 “情态动词 + 动词原形”。 (1)He must / may / might / could be listening to the radio now. 他一定/可能/也许正在听收音机。 (2)He can’t ( couldn’t ) / may ( might ) not be at home at this time. 这个时候他不可能/可能不在家。 (3)Mr. Bush is on time for everything .How can ( could ) he be late for the opening ceremony ? 布什先生一向准时,这次开幕式他怎么可能迟到呢? 3.对过去情况的推测,用“情态动词 + have +过去分词”。 (1)It must / may / might / could have rained last night .The ground is wet. 地湿了,昨晚肯定/可能/也许下雨了。 (2)The door was locked. He can ( could ) not / may ( might ) not have been at home . 门锁着,他不可能/可能不在家。 (3)Can / Could he have gotten the book? 难道他找到书了吗? 注:情态动词 should /ought to表推测时,意为“想必会,理应……”但与“have +过去 分词”连用时,则又可构成虚拟语气意为“本应该做某事却没做”。 例如: (4)It’s seven o’clock. Jack should/ought to be here at any moment. 现在七点钟了,杰克理应随时到达。(推测) (5)She should / ought to have attended your birthday party, but she had to look after her mother in hospital. (虚拟) 她本该出席你的生日晚会的,可是她得在医院照顾她妈妈。 (6)Tom should not /ought not to have told me your secret, but he meant no harm. (虚拟) 汤姆本不该告诉我你的秘密,可是他并无恶意。