would have done的用法
would+have+done虚拟语气
2. Without your help, I wouldn't have achieved so much. 没有你的帮助，我是不会取得如此大的成绩。
八、 “should+have+done”意思是“本来应该做某事，而实际没做。” “shouldn't+have+done”表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。
三、 “can+have+done”表示对过去行为的怀疑，用于疑问句，译成“可能做过……吗？”。
1. There is no light in the room. Can they have gone out? 屋里没有灯，他们可能出去了吗？
2. There is nowhere to find them. Where can they have gone? 到处找不到他们，他们可能到什么地方去呢？
“could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。
He could have passed the exam, but he was too careless. 本来他能够通过考试，但是他太粗心。
请看相关知识点：
一、 “must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。
As for the healthcare concerns you might harbor, I have no first-hand experience. The stories I have heard involve some guy waiting five hours in an ER only to be told by the physician what he needed was to have some rest and drink more water and fruit juice (as he was having a fever). No physician seems ready to prescribe antibiotics unless in a case of absolute necessity.
情态动词加have done的用法
四、 “may+have+done”
• 表示对发生过的事情的推测，意思是“可 能已经”或“也许已经”，用于肯定句中。 • • • • —What has happened to George? —I don't know. He may have got lost. —乔治发生了什么事？ ——我不知道，他可能迷路了。
一、 “must+have+done”
• 表示对过去事情的肯定推测，译成“一定 做过某事”，该结构只用于肯定句。 • 1. It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面 还是湿的。
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
八、 “should+have+done”
• 意思是“本来应该做某事，而实际没做。” “shouldn‘t+have+done”表示本来不应该做某 事，而实际做了。含有指责对方或自责的含意。 • • 1. Tom, you are too lazy. The work should have been finished yesterday. 汤姆，你太懒惰了，这 项工作本来应该昨天就做完的。 • 2. Look, Tom is crying. I shouldn't have been so harsh on him. 看，汤姆哭了，我本来不应该对他 如此严厉。
九、 “ought to+have+done”
• 表示过去应该做而实际并没有做，译成 “理应做……”，往往表示遗憾。与 “should+have+done”用法基本一样。
would have done是什么时态
would/should+have+过去分词，这是虚拟语气的一种用法。
would have done表示对过去事情的假设，意思是“本来会做”。
have done的用法1、should/ought to have done的含义.“should/ought to have＋过去分词”表示“过去应该做谋事却没有做”；“should not/ought not to have＋过去分词”表示“作了不应该做的事”. 含有责备或遗憾的意思。
例如：You shouldn’t /oughtn’t to have come here alone at such a late hour.你这么晚的时候本不一该一个人来这里的.（实际是一个人来的）She should/ought to have gone there alone.她本该一个人去那里的.（实际上不是）2、would have done的含义.would have done“本愿意做某事”,非虚拟语气时,就是would 情态动词加动词原形，have done 就是现在完成时,所以和起来就是将来完成时的用法，过去将来完成时表示在过去看来将来某时会已经完成的动作。
例如：She said she’d have finished her exams by then.她说那时她会已经考完试了。
He knew he arrived she would have gone home.他知道他到时她会已经回家了。
3、must have done的含义.“must have＋过去分词”表示对过去的推测,意思是“一定已经,想必已经,准是已经….”,只用于肯定句中.例如：He must have been drinking beer.他肯定一直喝啤酒来着。
若要表示否定,要用“can’t/couldn’t+ have+过去分词”,意思是“不可能”：The money can’t have been lost there.钱不可能是在那儿丢的。
情态动词havedone的用法
• He need have hurried to the station. In that case, he wouldn't have missed the train.
• 他本来需要快点去车站，那样的话，他就不会误 了火车。
总结：
• Can/could have done“本来能够做而没做” • Can’t/couldn’t have done “不可能做了…” • May/might have done “可能做过…” • Must have done “肯定做了…” • Should have done “本来应该做…”(实际上没做)
• 表示对过去事情的推测，might与may意思相同， 但可能性更小。多用于虚拟语气结构中。
• 1. He might have given you more help, even though he was busy. (MET90)
• 他或许会多给你一些帮助，即使他很忙。 • 2. She might have achieved greater progress,
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
二、 “can't+have+done”
• 表示对过去事情的否定推测，译成“不可能做过 某事”。
• 1. Mr. Smith can‘t have gone to Beijing, for I saw him in the library just now.
• 1. Tom, you are too lazy. The work should have been finished yesterday.
would have done的用法
would have done, might have done, could have done,should have done分别表示什么意思？2009/12/07 17:52一、在虚拟语气中的用法1. should have done 表示“过去本应该做某事却未做。
”其否定结构 shouldn't have done 表示“过去本不该做某事却做了。
”2. ought to have done 表示“过去本应该做某事却未做。
”其否定结构 oughtn't to have done 表示“过去本不该做某事却做了。
”have to do 表示不得不做，被迫做某事ought to do 与should do 都表示应该做某事，但ought to do 语气更强，常用于长辈对小辈的用语或某规则上的要求（严格的规则应用must ）．而 should do 可用语平辈朋友间，较为客气与口语化3. need have done 表示“过去本有必要做某事却未做。
”其否定结构 needn't have done 表示“过去本没必要做某事却做了。
”4. could (不能用 can) have done 表示“过去本能够做某事却未做。
”注意：其否定形式couldn't have done 没有虚拟语气的用法，couldn't have done 只能表推测，相当于 can't have done，意为：“过去不可能做了某事。
”5. might (不能用 may) have done 表示“过去本可以做某事却未做。
” 注意：其否定形式 might not have done 没有虚拟语气的用法，might not have done 只能表推测，相当于 may not have done，意为：“过去可能没有做某事。
”二、表推测的用法1. must have done表示对过去某事的肯定猜测，译为：过去肯定做了某事。
情态动词+have done用法讲解
1. would have done用于虚拟语气，表示对过去可能发生的情 况进行推测，意为“本来会做” He would have helped me, but he was so busy. 2. need have done 表示“本来需要做某事，但事实上没有做” needn’t have done 则表示“本来不需要做某事，而实际上做了 We need have hurried to school. In that case, we wouldn’t have been late for the class. I needn’t have cooked so many cakes; only two children came.
3. should have done 表示“本来应该做某事，二十几上没有做” shouldn’t have done 则表示“本来不应该做某事，而实际上做 了”，含有职责对法或自责之意。 The essay should have been finished last week, but I forgot it. Tom is crying ; I shouldn’t have been so harsh on him. 4. might have done 表示使对过去情况把握性不大的推测，意为 “可能坐过…”或表示说话人因某人没做某事而不满，意为 “本应该做…” He might have won the race, if you had been backing him. 5. must have done 表示对过去情况的肯定推测，意为“一定做过 某事”，该结构只用于肯定句 It must have rained last night, for the ground is wet.
情态动词+havedone用法总结
情态动词+ have done的用法总结一、“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。
1. It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面还是湿的。
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
二、“can't+have+done”表示对过去事情的否定推测，译成“不可能做过某事”。
1. Mr. Smith can't have gone to Beijing, for I saw him in the library just now. 史密斯先生不可能去北京了，我刚才还在图书馆见过他。
2. Mary can't have stolen your money. She has gone home. 玛丽不可能偷你的钱，她回家去了。
三、“can+have+done”表示对过去行为的怀疑，用于疑问句，译成“可能做过……吗？”。
1. There is no light in the room. Can they have gone out? 屋里没有灯，他们可能出去了吗？2. There is nowhere to find them. Where can they have gone? 到处找不到他们，他们可能到什么地方去呢？四、“could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。
He could have passed the exam, but he was too careless. 本来他能够通过考试，但是他太粗心。
五、“may+have+done”表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。
虚拟语气讲义(15个句式)
虚拟语气讲义1．虚拟语气句型1If + were/ did/ (动词的过去式), 主语+would/ might/ should / could + do 。
(表示对现在的假设)eg. If I were you, I would not be so proud . 如果我是你,我不会如此自负.eg. I don’t have a cellphone. If I had one , it would be convenient for me to get in touch with others 我没有手机，如果我有手机的话，和别人联系就方便的多了。
eg. If I were in your position, I would think better of it .如果我处在你现在的境地，我会重新考虑然后放弃。
2. 虚拟语气句型2If + had done, 主语+would/ might/ should / could + have done表示对过去或已经发生事情的虚拟假设。
eg. What a pity it is that you didn’t attended the concert yesterday! If you had attended the concert, you would have seen the famous singer.真遗憾你昨天没有去听音乐会。
如果你去了，你就会见到那位名歌手。
eg. Anyone in his position would have done the same= If anyone had been in his position, he would have done the same.3. 虚拟语气句型3If + were/ did(动词过去式)/should/ were to do , 主语+would/ might/ should / could + do (表示对将来的假设).eg. If he should refuse (= if he were to refuse = if he refused ), it wouldn’t matter 万一他拒绝了. 那也没有什么关系.eg. If you shouldn’t pa ss the college entrance examination, what would you do?万一你高考不中，你该怎么办？4. 虚拟语气条件句的倒装在虚拟条件句中，如果出现有were, had, should，可省去if，可将主语与这些词倒装，构成虚拟倒装句。
情态动词+have_done
“情态动词+have done”的用法一、“must+have+done”•表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。
• 1. It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面还是湿的。
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
二、“can't+have+done”•表示对过去事情的否定推测，译成“不可能做过某事”。
• 1. Mr. Smith can‘t have gone to Beijing, for I saw him in the library just now. 史密斯先生不可能去北京了，我刚才还在图书馆见过他。
• 2. Mary can't have stolen your money. She has gone home. 玛丽不可能偷你的钱，她回家去了。
•三、“can+have+done表示对过去行为的怀疑，用于疑问句，译成“可能做过……吗？”。
• 1. There is no light in the room. Can they have gone out? 屋里没有灯，他们可能出去了吗？• 2. There is nowhere to find them. Where can they have gone? 到处找不到他们，他们可能到什么地方去呢？四、“could+have+done”•是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。
••He could have passed the exam, but he was too careless. 本来他能够通过考试，但是他太粗心。
•五、“may+have+done”•表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。
wouldhavedone的用法与理解
wouldhavedone的用法与理解1. 什么是wouldhavedonewouldhavedone是一个英语短语，由would have和动词的过去分词形式组成。
它表示对过去发生的事情提出假设，表示过去本可以发生但最终没有发生的动作或情况。
2. wouldhavedone的构成wouldhavedone的构成可以分为两部分： - would have: 表示过去将要发生的假设情况； - 动词的过去分词形式：表示在假设情况下动作或状态的完成。
3. wouldhavedone的用法wouldhavedone的用法可以根据句子的时态来进行分类。
3.1 过去完成时的用法在过去完成时的情况下，wouldhavedone表示过去某个时间点之前本可以完成但最终没有完成的动作或状态。
3.1.1 肯定句•主语 + would have + 过去分词例如： I would have finished my homework if I had more time.（如果我有更多时间，我本可以完成作业。
）3.1.2 否定句•主语 + would not have + 过去分词例如： He would not have missed the train if he had left earlier.（如果他早点离开，他就不会错过火车。
）3.1.3 疑问句•Would + 主语 + have + 过去分词 + 其他？例如： Would you have gone to the party if I had invited you?（如果我邀请你，你会去参加派对吗？）3.2 过去完成进行时的用法在过去完成进行时的情况下，wouldhavedone表示过去某个时间点之前一直在进行但最终没有完成的动作或状态。
3.2.1 肯定句•主语 + would have been + 动词的现在分词例如： She would have been waiting for you if you had arrived on time.（如果你准时到达，她本会在等你。
wouldhavedone的用法与理解
wouldhavedone的用法与理解一、概述wouldhavedone是英语中的虚拟语气，表示“本来应该做某事”或“如果当时做了某事，结果会怎样”。
它由would have和过去分词构成。
在口语和书面语中都常常使用。
二、wouldhavedone的基本结构would have + 过去分词三、wouldhavedone表示的意义1. 表示过去未发生的事情，但是如果当时做了某事，结果会怎样。
例如：“If I had studied harder, I would have passed the exam.”（如果我当时学得更努力些，我就能通过考试了。
）2. 表示现在或将来可能发生的事情，但是如果当时做了某事，结果会不同。
例如：“If it rains tomorrow, we would have to cancel the picnic.”（如果明天下雨了，我们就得取消野餐计划。
）四、wouldhavedone与其他虚拟语气的区别1. 与had done的区别：had done表示过去完成时态，而would have done表示虚拟语气。
2. 与should have done的区别：should have done表示本应该做而没有做的事情；而would have done则表示如果当时做了某事，结果会怎样。
3. 与could have done的区别：could have done表示曾经有机会做某事却没有做；而would have done则表示如果当时做了某事，结果会怎样。
五、wouldhavedone的用法1. 表示对过去的推测例如：“If I had known you were in town, I would have invited you to my party.”（如果我当时知道你在城里，我就会邀请你来参加我的聚会了。
）2. 表示对现在或将来的猜测例如：“If it snows tomorrow, the roads would be dangerous to drive on.”（如果明天下雪了，路上开车会很危险。
情态动词+have_done的用法及与+v. 的比较
六、 “might+have+done.”
• 表示对过去事情的推测，might与may意思相同， 表示对过去事情的推测， 意思相同， 与 意思相同 但可能性更小。多用于虚拟语气 主结构中。 虚拟语气但可能性更小。多用于虚拟语气 if主结构中。 • • 1. He might have given you more help, even though he was busy. (MET90) 他或许会多给你一 些帮助，即使他很忙。 • 2. She might have achieved greater progress, if you had given her more chances. 如果你多给她 点机会，她可能已经取得更大的成绩。
四、 “could+have+done.”
• 是虚拟语气，表示对过去事情的假设，意 思是本来能够做某事而没有做。 • • He could have passed the exam, but he was too careless. 本来他能够通过考试， 但是他太粗心。
五、 “may+have+done.”
八、 “should (not) +have+done”
• 意思是“本来应该做某事，而实际没做。” 意思是“本来应该做某事，而实际没做。 “shouldn’t+have+done”表示本来不应该做某 表示本来不应该做某 而实际做了。含有指责对方或自责的含意。 事，而实际做了。含有指责对方或自责的含意。 • • 1. Tom, you are too lazy. The work should have been finished yesterday. 汤姆，你太懒惰了，这 项工作本来应该昨天就做完的。 • 2. Look, Tom is crying. I shouldn't have been so harsh on him. 看，汤姆哭了，我本来不应该对他 如此严厉。
wouldhavedone用法归纳
wouldhavedone用法归纳"Would have done" 是一种被动语态，也是过去完成时的构成形式。
它表达了虚拟的过去情况，即说话者在过去时想要完成事，但实际上并没有完成。
以下是"would have done" 的用法归纳。
1.表达过去的虚拟条件：- If I had known, I would have done things differently.（如果当时我知道的话，我会做事情不同。
）2.表达对过去的猜测或推测：- I wonder what he would have done if he was in my situation.（我想知道如果他处在和我相同的情况下，他会怎么做。
）3.表达过去的可能性：4.在谈论过去错过的机会时使用：- I wish I would have done things differently when I had the chance.（当时我有机会的时候，我希望我做了不同的选择。
）5.在表示对过去行为的类比时使用：6.给予对过去可能选择的建议：- If I were you, I would have done my homework earlier.（如果我是你，我会早点做作业。
）7.在表达对过去情况的后悔或遗憾时使用：- I wish I would have listened to my parents' advice.（我希望我能听父母的建议。
）需要注意的是，“would have done”是过去完成时的构成形式，一般由“would have”和动词的过去分词组成，不能直接用于肯定句中。
而在否定句中，表示"would not have done"或"wouldn't have done"。
would have done用法归纳
would have done用法归纳"Would have done"是一个复合时态，由情态动词"would"和动词的过去分词形式"have done"构成。
它用来表示过去发生的动作或情况，但在过去未实现或假设的情况下发生。
以下是"would have done"的用法归纳。
1.表示过去假设的情况："Would have done"常用于虚拟条件句中，表示对过去的假设或猜测。
例如：- If I had studied harder, I would have passed the e某am.（如果我学习更努力，我就能通过考试了。
）- If it hadn't rained, we would have gone to the beach.（如果没有下雨，我们就会去海滩了。
）2.表示之前的计划或打算：当过去的计划或打算没有实现时，可以使用"would have done"来表达遗憾。
例如：- I would have gone to the party, but I was feeling sick.（我本想去参加派对的，但当时觉得不舒服。
）3.表示说话人的建议或推测："Would have done"也可以用来表示说话人对过去情况的推测或建议。
例如：- He would have taken a different path if he had known about the traffic.（如果他知道交通情况，他会选择其他路线的。
）- She would have won the race if she hadn't stumbled at the last hurdle.（如果她没有在最后的障碍中绊倒，她会赢得比赛的。
）4. 与"wish"连用表示遗憾：在"wish"从句中，可以用"would have done"来表示过去的遗憾或后悔。
would been done的用法 -回复
would been done的用法-回复"Would have been done"是英语中的过去完成时态，用于表示在过去某个时间点之前已经完成的动作或事件。
该时态常用于条件句中，表示与过去某个时间点相关的假设或推测。
下面将逐步解释这个时态的用法。
1. 用于表示过去某个时间点之前已经完成的动作或事件过去完成时态常用于叙述已经发生的动作或事件，并明确指出这些动作或事件发生在过去的某个时间点之前。
比如：- The concert had already started when we arrived.（我们到达时音乐会已经开始了。
）- By the time she woke up, the sun had already risen.（她醒来时，太阳已经升起。
）2. 用于条件句中，表示与过去某个时间点相关的假设或推测过去完成时态常用于虚拟条件句中，表示与过去某个时间点相关的假设或推测。
比如：- If I had studied harder, I would have passed the exam.（如果我学得更用心，我就能通过考试了。
）- She would have visited her grandmother if she had had more free time.（如果她有更多的空闲时间，她会去看她的奶奶的。
）3. 其他用法过去完成时态还可以用于其他情况，如表示对过去的遗憾、对过去某个动作的评估等。
比如：- I wish I had listened to your advice.（我希望我当时听从了你的建议。
）- He said he would have gone if he had known it was going to be so much fun.（他说如果知道会这么有趣，他会去的。
）总结："Would have been done"是过去完成时态的形式，用于表示在过去某个时间点之前已经完成的动作或事件。
woulddone的用法
woulddone的用法一、什么是woulddone？二、使用woulddone的场景1. 计划完成某事2. 描述未来可能发生的情况3. 表示意愿或建议三、woulddone的语法用法1. woulddone + 动词原形2. woulddone + be + 形容词/名词短语3. woulddone + have + 过去分词四、woulddone与其他情态动词的比较五、woulddone的否定形式和问句形式六、woulddone在条件句中的应用一、什么是woulddone？Would done是一个英文表达方式，由助动词“would”和动词原形“do”组成。
它常用于表示过去某个时间点或特定条件下本该或可能会发生的事情。
Would done 可以描述计划执行某件事情、未来可能发生的情况，以及表示个人意愿或建议。
二、使用woulddone的场景1. 计划完成某事：Would done可用于表达我们预先计划好要做什么事情。
例如：I told him that I would finish the report by tomorrow.(我告诉他明天前我会完成报告。
)2. 描述未来可能发生的情况：我们可以使用would done来描述根据目前的条件或趋势，未来可能发生的一些事件。
例如：If it continues raining, we would need to cancel the outdoor event.(如果继续下雨，我们就需要取消户外活动了。
)3. 表示意愿或建议：Would done也可以表达个人意愿或建议。
例如：I would have a cup of tea instead of coffee.(我宁愿喝茶而不是咖啡。
)三、woulddone的语法用法1. woulddone + 动词原形：当我们使用would done表示计划完成某事时，通常需接一个动词原形来表示具体的行动。
通过高考题精讲 would have done的用法
通过高考题精讲
would have done的用法
would have done的用法：
1. 表示对过去的推测（常用于宾语从句中表过去将来完成时）。
2. 用于过去的虚拟语气的从句中。
The mayor of Beijing said that all construction work for the Beijing Olympics _____ by 2006.
A. has been completed
B. has completed
C. would have been completed
D. would have completed
解析：本题选择C.
宾语从句的主句用了said，所以下文by 2006, 结合起来就是过去将来完成时，当然这里用被动语态。
would have done表示对过去的推测。
I was wearing a seatbelt. If I hadn’t been wearing one, I ____.
A. were injured
B. would be injured
C. had been injured
D. would have been injured
解析：本题选择D.
would have done用于过去的虚拟语气的从句中
根据从句If I hadn’t been wearing one看，是对过去情况的虚拟语气，所以主句用would have done。
wouldhavedone虚拟语气（会已经虚拟语气）
would+have+done虚拟语气（会+已经虚拟语气）The subjunctive mood of would+have+done indicates the hypothesis of what happened in the past, which means that it would have been done".1., I, would, have, told, you, all, about, the, boy's, story, but, you, didn't, ask, me., I would have told you the story of the little boy, but you didn't ask me.2., Without, your, help, I, wouldn't, have, achieved, so, much., without your help, I wouldn't have achieved so much."Could+have+done" is the subjunctive mood, which means the assumption of something in the past. It means that you could have done something without doing it.He could, have, passed, the, exam, but, he, was, too, careless., he could have passed the exam, but he was too careless.Please look at the relevant knowledge:First, "must+have+done" means the affirmation of the past, and the inference is "something must have been done". The structure is used only in affirmative sentences.1., It, must, have, rained, last, night, for, the, ground, is, wet.. It must have rained last night, for the ground is still wet.2., You, must, have, been, mad, servant., to, speak, to, the, you must have gone crazy talking to your servant.Two, "can't+have+done" means negative speculation about what happened in the past".1., Mr., Smith, can't, have, gone, to, Beijing, for, I, saw,, him, in, the, library, just, now., Mr. Smith could not have gone to Hong Kong. I saw him in the library just now.Marie Mary can't have stolen your money. She has gone home. can not steal your money, she went home.Three, "can+have+done" means the suspicion of past actions, which is used in interrogative sentences...... Is that right?".1., There, is, no, light, in, the, room., Can,, they, have, gone, out? There is no light in the house. May they go out?2., There, is, nowhere, to, find, them., Where, can, they, have, gone? They are nowhere to be found. Where can they go?Four, "could+have+done" is the subjunctive mood, which means the assumption of something in the past. It means that you could have done something without doing it.He could, have, passed, the, exam, but, he, was, too, careless., he could have passed the exam, but he was too careless.Five, "may+have+done" means a conjecture of what has happened, meaning "may have" or "maybe" already, used in affirmative sentences.- What, has, happened, to, George?- I, don't, know., He, may, have, lost., got- what happened to George?I don't know. He may have lost his way.Six, "might+have+done" means the speculation of the past, might and may mean the same, but the possibility is smaller. Mostly used in subjunctive mood structures.1., He, might, have, given, you, more, help, even, though, he, was, busy., he might be able to give you more help, even if he is busy.2., She, might, have, achieved, greater, progress, if, you, had, given, her, more, chances., if you give her more opportunities, she may have achieved greater success.Seven, "would+have+done" subjunctive mood, which represents the assumption of the past, which means that it would have been done".1., I, would, have, told, you, all, about, the, boy's, story, but, you, didn't, ask, me., I would have told you the story of the little boy, but you didn't ask me.2., Without, your, help, I, wouldn't, have, achieved, so, much., without your help, I wouldn't have achieved so much.Eight, "should+have+done" means "should have done something", and actually did not do." "Shouldn't+have+done" means that something should not have been done, but actually done. Containing the meaning of blaming the other or blaming oneself.Tom, you, are, too, lazy., The,, work, should, have, been, finished, yesterday., Tom, you are too lazy, the work should have been done yesterday.Look Tom is crying. I shouldn't have been so harsh on him. look, Tom cried, I shouldn't have been so strict with him.Nine, "ought to+have+done" means that the past should be done, and actually did not do, translated into "should do"......" Often express regret. Basically the same as"should+have+done".I ought, to, have, gone, home, last, Sunday.,, I should have gone home last Sunday.You ought, not, to, have, given, him, more, help., you shouldn't have helped him so much.Ten, "need+have+done" means that something needs to be done, but not done. "Needn't+have+done" means "do not need to do something"".I, needn't, have, bought, so, much, wine,, only, five, people, came.. I didn't need to buy so much wine. Only a few people came.He, need, have, hurried, to, the, station., In, that, case, be,wouldn't, train., have, missed, the, he needed to go to the station quickly, so he wouldn't miss the train.Would, like, to, have, done, sth are meant to do somethingI, would, like, to, have, the, article, but, I, read, was, very, busy, then.Would rather +have done would rather do or not do it at that timeI, would, rather, have, refuse, his, offerI'm, using, a, computer, with, no, Chinese, configuration., Sorry,, for, the, language.As for the healthcare concerns you might harbor, I have no first-hand experience. The stories I have heard involve some guy waiting five hours in an ER only to be told by the physician what he needed was to have some rest and drink more water and fruit juice (as he was having a fever No physician seems ready to). Prescribe antibiotics unless in a case of absolute necessity.A, shortage, of, heathlcare, seems, to, be, issue, plaguing, Ontario, and, it, is, an, issue, that, has, been, brought, to, the,, attention, of, an, the, Parliament, resources, according, media, to, the。
wouldhavedone虚拟语气[重点]
![wouldhavedone虚拟语气[重点]](https://img.taocdn.com/s3/m/a0940798a1116c175f0e7cd184254b35eefd1a32.png)
would+have+done虚拟语气“would+have+done”虚拟语气，表示对过去事情的假设，意思是“本来会做”。
1. I would have told you all about the boy's story, but you didn't ask me. 我本来会告诉你这个小男孩的故事，但是你没有问我。
2. Without your help, I wouldn't have achieved so much. 没有你的帮助，我是不会取得如此大的成绩。
“could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。
He could have passed the exam, but he was too careless. 本来他能够通过考试，但是他太粗心。
请看相关知识点：一、“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。
1. It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面还是湿的。
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
二、“can't+have+done”表示对过去事情的否定推测，译成“不可能做过某事”。
1. Mr. Smith can't have gone to Beijing, for I saw him in the library just now. 史密斯先生不可能去北京了，我刚才还在图书馆见过他。
2. Mary can't have stolen your money. She has gone home. 玛丽不可能偷你的钱，她回家去了。
三、“can+have+done”表示对过去行为的怀疑，用于疑问句，译成“可能做过……吗？”。
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would have done, might have done, could have done,should have done分别表示什么意思？
2009/12/07 17:52
一、在虚拟语气中的用法
1. should have done 表示“过去本应该做某事却未做。
”其否定结构 shouldn't have done 表示“过去本不该做某事却做了。
”
2. ought to have done 表示“过去本应该做某事却未做。
”其否定结构 oughtn't to have done 表示“过去本不该做某事却做了。
”
have to do 表示不得不做，被迫做某事
ought to do 与should do 都表示应该做某事，
但ought to do 语气更强，常用于长辈对小辈的用语或某规则上的要求（严格的规则应用must ）．
而 should do 可用语平辈朋友间，较为客气与口语化
3. need have done 表示“过去本有必要做某事却未做。
”其否定结构 needn't have done 表示“过去本没必要做某事却做了。
”
4. could (不能用 can) have done 表示“过去本能够做某事却未做。
”注意：其否定形式couldn't have done 没有虚拟语气的用法，couldn't have done 只能表推测，相当于 can't have done，意为：“过去不可能做了某事。
”
5. might (不能用 may) have done 表示“过去本可以做某事却未做。
” 注意：其否定形式 might not have done 没有虚拟语气的用法，might not have done 只能表推测，相当于 may not have done，意为：“过去可能没有做某事。
”
二、表推测的用法
1. must have done
表示对过去某事的肯定猜测，译为：过去肯定做了某事。
不存在 mustn't have done 的形式。
其否定或疑问形式须用 can(could) 来表示. 例如：
Since the road is wet, it must have rained last night. 既然路是湿的，那昨天晚上肯定下雨了。
He can't have missed the way. I drew him a map. 他不可能迷路。
我（当时）给他画了张图。
“The dictionary has disappeared. Who could have taken it?” 词典不见了，（过去）谁可能把它拿走了？
2. may / might have done
may / might have done 表示“过去可能做了某事”。
may 比 might 表示的可能性在说话人看来稍大些。
may/might not have done表示“过去可能没有做某事。
”例如：
I can't find my keys. I may / might have left them at the school yesterday. 我找不到我的钥匙了。
我可能昨天把他们落在学校了。
John may/might not have passed the exam; he looks very sad.约翰可能没有通过考试。
他看起来很忧伤。
注意：may/might have done表推测不能用于疑问句中。
3. can/could have done 表推测一般用在否定句和疑问句中，表示不相信或怀疑的态度。
Can/Could he have passed the exam?他可能通过了考试吗？
I think that he couldn’t/can't have gone abroad. I saw him just now.我认为他不可能出国了。
我刚才还看见他了。
注：表示推测过去某动作发生的可能性时，就表示的可能性程度而言，must 最大，could 其次，may 更次之，might 最小。
例如：
“I wonder how Tom knew about your past.” “我想知道汤姆是怎么知道你的过去的。
”
“He must / could / may / might have heard of it from Mary.” “他肯定/很可能/可能/兴许（没准儿）已从玛丽那儿听说此事了。
”。