必修四module6grammar情态动词
grammar 情态动词
1.--Excuse me, but I want to use your computer to type a report. A have my computer if you don’t take --You ____ care of it. A. shan’t B. might not C. needn’t D. shouldn’t 2. ---When can I come for the photos ? I need them tomorrow afternoon. B ---They _____be ready by 12 : 00 . A. can B. should C. might D. need 3. With so much work on hand, you ____to D see the game last night. A. mustn’t go B. could have gone C. shouldn’t go D. shouldn’t have gone
Modal verbs I
情态动词的语法特征
1. 情态动词有一定的意义，只表示期待或估计某事的 发生，不能表示正在发生或已经发生的事情。 2. 没有人称和数的变化，即情态动词第三人称单数不 加-s。 3. 不能独立使用，它和后面的动词构成谓语。 4. 情态动词 除ought 和have 外，后面只能接不带 to 的不定式。 5. 情态动词没有非谓语形式，即没有不定式，分词， 等形式。
He might be doing his homework now. （可能性更小）
2.might/may have done,表示对过去发生的动作进行 可能性推测， 他可能去医务室了。 He may have gone to the clinic. 他可能已经从报纸上知道这个消息了。 He might have read about the news in the newspaper.
同步外研英语必修四新突破课件：Module6SectionⅢGrammar——情态动词+havedo
Module 6 UnexplainedMysteriesSec8or?te噌期Sli餵理糅态动词+ have done的用法点严1. may/might have done sth.表示对过去行为的推测，意为“也许/或许己经做过某事” ,might可能性更小，主要用于肯定句和否定句：； ! ! ：• > ； IJohn isn't at home.I think he may/might have gone to school.约翰不在家，我想他可能去上学了吧。
；；；You might have read about it in the newspapers.你可能已经在报纸上看到这个消息了。
：：；［名师点津］；might have done有时表示“本来可以做的事而实际上没有做”，含有“劝告，责备”的语气；；；；You might have been more careful.你本来可以多加小心的。
2. must have done sfh.表示对过去发生的事或行为的肯定推测，意为“一定做过某事”，只用于肯定句中。
：；；He reasoned that since she had not answered his letter she must have left here.他推断，由于她没有给他回信，她一定是己经离开这里To［名师点津］；含有must have done结构的反意疑问句中，若有表示过去的时间状语，反意疑问部分用“didnt+主语？” ；若没有表示过去的时间状语，反意疑问部分则用a haven't/hasn't+主语？”。
: They must have gone there last night, didn't they?他们昨晚一定是去那里了，不是吗？；；；They must have been to the Great Wall, haven't they?他们一定去过长城，不是吗？ ! ；；；；:3. can/could have done sth.^对过去的推测，表示“可能做过某事”，主要用于否定句和疑问句中。
外研社高中英语必修四Module 6 备课参考
Module 6单元目标1. 根据起始段落预测文章出处。
学会提取文章主要信息，归纳文章的主旨大意。
根据上下文正确理解生词含义。
2. 正确使用情态动词来表示猜测，特别是对过去的猜测。
3. 复习并归纳may have done 或might have done的意义和用法，熟练应用这一结构。
Unit 1要点精讲1．attack动词v. 进攻；攻击start fighting or hurting someoneWe attacked the enemy by night.The best way to defend is to attack.The robber attacked the old man.动词v. （疾病）侵袭make someone suddenly illMeasles attacks many children.很多孩子得麻疹。
She was attacked with a disease.动词v. 攻击；抨击speak or write againstHis remarks were attacked in the newspaper.动词v. 开始；着手set aboutThey next attacked the problem of food supply.下一步他们着手解决粮食供应问题。
名词n. 攻击；进攻the act of attackingThree attacks were made during the night.They made an attack on the invaders by night.The attack started at dawn.Attack is the best defence.She died of an heart attack.air attacksa heart attacka night attacka surprise attackunder the attack ofmake an attack againstresist the attack of2．exist不及物动词vi. 存在to be, to be realWe cannot exist without air.Does life exist on other planets?The Qin dynasty existed for a very short period.Matter generally exists in three states: gas, liquid and solid.They cannot exist on such a small income.exist on foodAny Existence is Reasonable.—Hegel3．claim及物动词vt. 认领to say that something belongs to youI lost my umbrella, but claimed it at the lost property office.Has anyone claimed this pencil box?及物动词vt. 提出要求say that you should have somethingHe can fairly claim to have more.及物动词vt. 宣布某事实；声言state as a fact, despite objections; assert; maintainHe claims to have written the article in two days.He claimed he had not been at the scene of the crime.He claimed that he wasn’t told to come.claim a large amount against himclaim payment from himclaim 2,000 dollars from him for damage名词n. 要求（所有权）a demand for something to which one has a real or supposed rightHe has the best claim to the honour.bring forward a claim todrop （=lay aside; waive）one’s claimmake a claim to this umbrella4．cover动词v. 盖，遮盖to put one thing over another, to hide or protect itPat covered her head with a scarf.I had no umbrella so I covered my head with a newspaper when it rained. Please cover the bowl with a piece of paper.Flood water covers our fields.A passing lorry covered us in mud from head to foot.The house is covered from sight by a forest.动词v. 走完（一段路）pass or travel over （a route）The cars covered 200 miles a day.He covered the distance in fifteen minutes.动词v. 够支付be sufficient to meetWill 10 pounds cover the cost of a new shirt?My salary fully covers all expenses.动词v. 掩护，保护hide by covering; keep from viewThe thick woods covered the fugitive.Our planes covered the tanks which were attacking the enemy. 动词v. （以枪炮）对…瞄准keep in line of fire （with a gun）Enemy guns covered the valley.He covered the thief with a pistol.可数名词n.[C] 盖子；套子；罩thing that you put over anotherThe cover of a pot is called a lid.Will you please take the cover from the bottle?可数名词n.[C] 封面；书皮；封套outside of a bookMy book needs a new cover.Her portrait appears on the front cover to that magazine.不可数名词n.[U] 掩护物；掩蔽处place that keeps you safeThe mountain makes good cover for the soldiers.They ran away under the cover of mist.5．adapt不及物动词To become adapted:适应，顺应：a species that has adapted well to winter climes.及物动词vt. 使适合make to fit in a new place; make fit forHe adapted his old car engine to the boat.adapt oneself to a new job使自己适应新的工作adapt one’s thinking to the new situation使思想适应新形势6．disappear不及物动词vi. 消失，失踪；不见go away so that it cannot be seenOne of our cats has disappeared.The police are looking for the man who disappeared yesterday. She made a bow and disappeared behind the curtain.The train disappeared into the tunnel.7．fierce形容词adj. 凶猛，激烈的strong and dangerousThere was some fierce fighting.The fierce mountain lion attacked a flock of sheep.那只凶猛的美洲狮袭击了羊群。
Module 6 Period Four Grammar情态动词+have done的用法 课件(外研版必修4,课标通用)
done的形式。
答案 D
重点语法精析
解码书面表达
勤思巧学园地
2．(1)can/could have done表示对过去的推理，用于否定句， 疑问句中，表示对发生行为的惊疑、怀疑或不肯定， could语气较委婉，“本来可以”“可能已经”。如用在否定 句中，否定意义最强烈，通常有迹象表明根本不可能。 Where can they have gone？他们能去哪儿呢？(表惊疑) They could have gone to the cinema. 他们可能去电影院了。(表不肯定) I met him at school yesterday afternoon，so he couldn't have attended your lecture. 昨天下午我在学校遇上他了，因此他不可能参加你的讲 座。(有迹象表明，强烈地否定)
重点语法精析
解码书面表达
勤思巧学园地
【单项填空】
—Have you seen my key? I remember I put it here yesterday.
—Don't worry.You________it in the wrong place.
A．must put
B．should have put
D．ought to have come
解析 本题考查情态动词。句意：昨天的聚会非常成功，
很有趣。你本来应该来的，为什么没有来？句子说的是对
已经发生的事情的推测，应用“情态动词＋have done”结
构，故排除A项；B项表示“准是已经做某事”；C项表示“可
能已经做某事”；D项表示“本来应该做某事”，由句意知D
重点语法精析
解码书面表达
外研版高一英语必修四：Module6Grammar课件
FUNCTION小结:
may:
might:
可能会,或许会
可能,或许(语气更不肯定)
unlikely: 可能性不大的(形容词)
3.can表示可能: 1) .can可表示“条件许可” 相当于it
is You can walk on the ice. possible, 你能在冰上行走。
We can’t swim here on account of the
sharks.
我们不能在这儿游泳,因为有鲨鱼。
2). can也可表示偶然的可能性:
Shall: 用于第二和第三陈述句中,表示决心, 强制,命令,警告,允诺等。
The shares shall be divided into five parts according to the law. 根据法律这些股份将被分成五份。
Will:
表示客观规律
Байду номын сангаас
Tomorrow will be Sunday.
may/might也可以与不定式的进行式连用: He may/might be watching TV at home
now. 他也许正在家里看电视。 He may/might be waiting at the station when we arrive. 我们到达车站时,也许他会在那儿等。
may/might + have+done 用于推测过去的
didn’t/needn’t to do 本不需要做而实际上也没做 should have done 本应该做而实际上没做 (责备)
必修四module6知识点精讲及练习
Module 6 Unexplained mysteries of thenatural worldThe burning desire to succeedThe motivation to succeed comes from the burning desire to achieve a purpose. Napoleon Hill wrote, “Whatever the mind of man can conceive1 and believe, the mind can achieve．”A young man asked Socrates the secret to success. Socrates told the young man to meet him near the river the next morning. They met. Socrates asked the young man to walk with him toward the river. When the water got up to their neck, Socrates took the young man by surprise and ducked him into the water. The boy struggled to get out but Socrates was strong and kept him there until the boy started turning blue. Socrates pulled his head out of the water and the first thing the young man did was to gasp and take a deep breath of air. Socrates asked, “What did you want the most when you were there？” The boy replied，“Air.” socrates said, “That is the secret to success. When you want success as badly as you wanted the air, then you will get it. There is no othe r secret.”A burning desire is the starting point of all accomplishment. Just like a small fire cannot give much heat, a weak desire cannot produce great results.【助读词汇】1．conceive vt. 怀有2．duck...into... 把……猛按进……3．gasp vi. 喘息【佳句变换】1．whatever让步状语从句Whatever you want to be, you can be it as long as you struggle on.只要你继续努力，你就可以达到目标。
外研版必修四语法之情态动词详析及练习(有答案)
情态动词概念：在动词（一般动词）之前形成动词的否定，疑问，时态，语态，语气或表示特殊意义的动词叫做助动词，其中具有感情色彩一些助动词叫做情态动词。
分类：need, dare, used和had better.---情态动词例如:----What was the somethi ng you saw?你看见的是什么？----I …,I couldn 'say.我不能说。
----You couldn 'say or you wouldn ' s t y?你不能说还是你不愿意说?情态动词是一种本身有一定的词义，但要与动词原形及其被动语态一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。
情态动词后面加动词原形。
shall1.shall在纯表示将来的陈述句中只用于第一人称。
2.在问句中征求对方的意见和指示的时候常用于第一、三人称。
Shall I post your letter for you?Shall we carry your baggage?Henry is wait ing outside. Shall he come in?3.用于第二、三人称，表示说话人的许诺、命令、警告、威胁或允诺等。
Tell Jerry that he shall get a gift if he is nice.You shall be punished for what you ' ve done.should1.构成过去将来时作为shall的过去时He asked me whether I should be free toni ght.2.表示主语的义务或责任。
You shouldn ' t eat between meals, for it will make you fat.3.表示很大的可能性，常译为按道理说应该”There should be a double “ m” in the word swimming.4.用于否定句、疑问句表示竟然”含意外、惊异、愤怒、失望等语气。
2020-2021学年英语外研版：Module 6 Grammar——情态动词
2．It o'clock.
A．mustn't C．won't
答案：B
be the postman at the door. It's only six
B．can't D．needn't
解析：句意：门口不可能是邮递员。(现在)才六点钟。由“It's only six o'clock”可知，此处表示对现在情况的否定推测，应用 can't(不可 能)，而 mustn't 表示“禁止”，won't 表示“不会”，needn't 表示“不 必”，均不符合句意。
二、can't 的用法 1．用于否定句中，意为“不可能”，表示把握比较大的推 测。“can't＋动词原形”表示对现在或将来的事的否定推测； “can't＋be＋v.-ing”表示对现在发生的事的否定推测；“can't ＋have＋v.-ed”表示对过去的事的否定推测。 That can't be Mary, for she is in hospital. 那不可能是玛丽，因为她在住院。
⑧You should read the poem sometime. ⑨Could you answer a few questions, please? ⑩I told her to stop singing, but she wouldn't listen.
必修4Module6外研社高中英语必修四单元6各知识点
④选择正确的句子： 他和Melissa相处得并不融洽，因此他不可能邀请她参加这个聚 会。( a )
a. He doesn’t get along well with Melissa, so he is unlikely to invite her to the party.
b. He doesn’t get along well with Melissa, so he is impossible to invite her to the party.
【熟词生义】根据语境选择最正确汉意：
The flood claimed hundreds of lives.
A.声称
B.认领
C.索赔
D.夺走
【解析】选D。claim有“使失踪、死亡〞之意。
4.unlikely adj.不可能的 ① The project is unlikely to succeed if not carefully planned. 如果不进展精心方案，这个工程就不可能成功。 ② It is unlikely that she will accept the plan made by the boss. 她不可能承受老板制订的方案。 ③ She gave an unlikely explanation for her behaviour. 她对自己的行为给出了一个让人难以置信的解释。
3.Other members of the royal family were allowed to wear dragon symbols,too,but with fewer claws and _o_f_a__d_i_ff_e_r_en__t __ _c_o_lo_u_r_(颜色不同). 4.Some experts believe it is _d_u_e__to__th__e_a_n_i_m_a_l_s_t_h_e_m__y_t_h_s_g_r_e_w_
2020-2021学年英语外研版必修4学案：Module 6 Section Ⅲ Grammar
Section ⅢGrammar“情态动词＋have done”结构表一：“情态动词＋have done”表示对过去的推测表二：“情态动词＋have done”表示对过去的虚拟【例1】The children________(get) lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.【解析】根据后文they would have been 可知动作发生在过去，用“情态动词＋have done”。
由句意可知“他们一定是在森林中迷路了”。
【答案】must have got【例2】Harry is feeling uncomfortable. He ________(drink) too much at the party last night.【解析】must 用于对过去事情的推测。
must have done 一定做过某事。
句意：Harry 正感觉不舒服，他一定是在昨晚的派对上喝了很多酒。
【答案】must have drunk【例3】Since nobody gave him any help, he________have done the research on his own.【解析】表示对过去肯定的猜测，故用must have done，句意：没有人帮他，一定是他独自做的实验。
【答案】must【例4】We________(face) the difficulty together，but why didn't you tell me?【解析】could have done过去本能够做……却未做。
【答案】could have faced【例5】—Happy birthday!—Thank you！It's the best present I________(wish) for.【解析】could have done能够做过某事。
grammar-情态动词
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。例如：
During the vacation, he would visit me every other day. The wound would not heal. 4) 表示估计和猜想。例如： It would be about ten o’clock when she left home.
---- May/Might I take this book out of the room?
---- Yes, you can. (No, you can’t / mustn’t. )
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。 例如：
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。 例如：
His play isn’t interesting, I really must go now. I had to work when I was your age.
1) shall 用于第一人称，征求对方的意见。 例如：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。
You shall fail if you don’t work hard. (警告)
He shall have the book when I finish it.(允诺) He shall be punished.(威胁)
外研版高中英语必修4讲义Module 6 Section Ⅲ Grammar——情态动词+have done的用法
Section ⅢGrammar——情态动词＋havedone的用法语境自主领悟先观察原句①Many people think the monster may be a distant cousin of the Loch Ness monster in Scotland.②They also think that there might be similar creatures in other lakes around the world.③But in China，the idea of the dragon may have come from the alligator.④You might have given your parents more help earlier.⑤It must have rained last night，for the road was quite muddy.⑥He can't have forgotten it，for he talked about it yesterday.⑦You ought to/should have done the job more carefully.⑧You oughtn't to/shouldn't have asked such a foolish question.后自主感悟1.①②句表示可能性的推测，意为“可能，也许”。
2.③④句表示对过去发生的事情的推测，意为“可能已经”。
3.⑤句表示对过去事情的很有把握的肯定推测，意为“肯定做过某事”，而⑥句则表示对过去发生事情的有把握的否定推测，意为“不可能做过某事”。
4.⑦句表示“过去本应该做却未做的事”，⑧句则表示“过去本不该发生却发生了的事”。
1．may/might have done sth.表示对过去行为的推测，意为“也许/或许已经做过某事”，might可能性更小，主要用于肯定句和否定句中。
英语外研版必修4课件：Module 6 Section Ⅲ Grammar
【例 5】 —Happy birthday! —Thank you！It's the best present I_____________(wish) for.
【解析】 could have done 能够做过某事。
【答案】 could have wished
【例 6】 We_____________have bought so much food now that Suzie won't be with us for dinner.
Module 6
Unexplained Mysteries of the Natural World
Section Ⅲ Grammar
“情态动词＋have done”结构 表一：“情态动词＋have done”表示对过去的推测
表二：“情态动词＋have done”表示对过去的虚拟
【例 1】 The children_____________(get) lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
【解析】 根据后文 they would have been 可知动作发生在 过去，用“情态动词＋have done”。由句意可知“他们一定是 在森林中迷路了”。
【答案】 must have got
【 例 2 】 Harry is feeling uncomfortable. He _____________(drink) too much at the party last night.
【解析】 needn't have done 不必做过某事却做了。 【答案】 needn't
外研高中必修 4 module6 知识辅导
必修4第6模块知识辅导重点单词【词条1】attackIt often gets angry and will attack anyone who goes close to it. (Page 51)【点拨】这句话的意思是“它经常生气 ,会袭击靠近它的任何人〞。
其中attack为及物动词 ,意思是“袭击〞 , attack也可作不及物动词。
如：A girl was attacked and robbed by two strong men.The enemy attacked during the night.【拓展】1. attack也可当“抨击〞讲 ,搭配为attack sb. / sth. (for sth. / doing sth.)。
如：He was attacked for his corruption.2. attack也可作名词 ,和动词launch / make等搭配 , launch / make an attack (on sb. / sth.) 攻击……。
如：They launched an attack on racism.【词条2】claim【课文原句】He claims to have seen a round black creature moving quickly through the water. 〔Page 52〕【点拨】这句话的意思是“他说他看见一个圆形黑色的东西在湖面快速游过〞。
其中claim的意思是“宣称 ,声称〞 ,后可跟that从句或动词不定式。
如：I don’t claim to be an expert.He claimed he should be given a fairer opportunity.【拓展】claim的意思还有：1.要求 ,认领。
如：Has anyone claimed this watch?2. 索赔 ,索取。
如：Did you claim the insurance after your car accident?3. 注意 ,思考。
高一英语外研版必修4：Module+6+Section+Ⅳ Grammar++Writing
3．I didn't realize what happened until a small yellow creature with three eyes came out.
(用倒装句式改写句子)
【答案】 1.I was riding through a small dark alley after evening class when a strong light shone me.
2．Then I found out that it was a triangle flying machine which I was sure I had never seen before.
3．Not until a small yellow creature with three eyes came out did I realize what had happened.
Ⅰ.单句语法填空
ห้องสมุดไป่ตู้
1．He was aware that someone
have entered his room.
2．—Mummy，I climbed to get the teddy bear from the top of the shelf.
—My goodness！You 3．—I'm sorry.I
6．There have been stories of...since... 7．Some people saw it in...for the first time... 8．In my view，first of all，...leaves me a deep impression. 9．Some people believe in its existence，because... 10．By recent research，we can learn that...
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needn’t+have done
本可不必而却做了 其实你不必带早餐来的，因为我不饿。 You needn’t have brought breakfast, as I am not huave done
用于虚拟语气的句子中： I would not/never have succeeded without your help. 要不是你们的帮助，我是不会成功的。
• Could+ have done 表示“过去本来有可能 或能够做到，但因为种种原因而实际上并 没有做到”，含有劝告、责备的意思，译 作“本来能够，本来可以” • He could have finished his work all by himself。 • 他本来可以独立完成他的工作的。
除了may/might以外，下列几个情态动词也可以 与完成式连用：
would like to have done
本来想干而实际上没干成 I would like to have gone to the cinema, but I had an unexpected visitor that evening.
Needn’t +have done 表示过去做了本来 不必做或不需要做的事或过去做某事纯 属多余，含有“根本不必，本来没必要 做”也可以用于疑问句。 It was so near. We needn’t have taken a taxi.路这么近，我们本来没必 要坐出租车来的。
should /ought to +have done • 常表示句子的主语“过去本该做 而实际上却没做”的事，常有后悔、 埋怨或责备的口气，译作“本该 的”。Ought to 比should语气强。 • The bus has left.You should have come here a few minutes earlier. • 那班车开走了，你本该早来这几分 钟。
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• Had better + have done表示事后建议，含 有轻微责备的口吻，“当时最好做了某事 • We had better have followed his advice。 • 我们当时最好听他的建议。 • Would rather+have done 表示”当时宁愿 做某事”、有后悔意思。 • I was angry with her，but now I would rather not have done that。 • 我曾很生他的气，但现在我希望没那么做。
• Can’t/couldn’t +have done表示说话者对过 去的动作或存在的状态进行的否定推测， 翻译为“不可能” • She can’t have been to your house. She doesn’t know your address. • 她不可能去过你家，她不知道你的地址。
他说他们也许已经错过了那班飞机。 He said that they may/might have missed the plane. 当我到达车站时，火车也许刚刚开走。 When I got to the station, the train may/might have just left.
1.may/might+不定式的一般（现在）式可 以表示现在或将来的可能性： 史密斯先生（现在）也许知道我的地址。 Mr. Smith may/might know my address. 他也许会告诉他父亲真相。 He may/might tell his father about the truth.
can/could+have done
本来可以，可能已经 1.---她们能去哪里呢？ ---她们可能去电影院了。 ---她们不可能去工作，因为是周末。 Where can they have gone? They could have gone to the cinema. They can’t have gone to work,as it’s weekend.
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shouldn’t /oughtn’t to +have done
• 表示“过去本不该做而实际上却做 了”，译作“本不该，，，却做了” • You oughtn’t to have talked to your mother like that.你本不该那 样对你母亲说话的。
would+have done • 表示过去本来要做某事却因某 种原因未做，通常用来说明某 种情况，但不含责备之意。 • I would have written to you earlier but I have been ill。 • 我本来要早点给你写信的，但 我生病了。
must+have done
想必一定，准是 昨晚一定下雨了，因为路面很泥泞。 It must have rained, for the road is quite muddy.
should+have done= ought to +have done 过去本该做而却未做 shouldn’t have done= ought not to have done 过去不该做却做了 Please give some examples:
2.may/might也可以与进行式连用：
他也许正在家看电视。 He may/might be watching TV at home now. 我们到达车站时，也许他会在那儿等。 When we arrive, he may/might be waiting at the station.
二、情态动词+have done 表示对过去的虚拟
Module 6
Unexplained Mysteries of the Natural World
Grammar
may/might表示 “可能性”的用法
一、情态动词+have done 表示对过去的推测
• Must+have done表示说话者对已经发生的动 作或存在的状态进行的一种合乎情理的推断， 或很有把握的推测，一般用于肯定句，翻译为 “准时已经”“肯定已经了” • The ground is wet this morning. It _must have _rained_______ • last night. • 今天早晨地面湿漉漉的，昨天晚上一定下雨了。
• Might+have done 表示“过去本可以做而 实际上却没有” • You might have written to me when you were free.你有空时本可以写信给我的。
你本来可以做得更好，但你太粗心了。 You could have done better, but you were too careless.
• May/might +have done表示说话者对过去 可能已经发生的动作或存在的状态进行的 推测或猜想，一般用于肯定句（可能已经 中），译作“或许已经” “可能已经” • 用于否定句中表示“可能还没有”might 没 有may语气强。 • Nobody stopped him;he might have been a passenger’s child.没人制止他，他或许是 一个旅客的孩子。 • He may not have finished his homework. • 他或许还没有完成作业。