Speculation and Deduction: 句子、练习、测试和例句

Speculation and Deduction 使用

推测与推断用于我们进行推测并根据我们所知道、看到、听到的内容，或认为可能的情况，作出合乎逻辑的推断时。我们最常使用must、may、might、could、can’t和should等情态动词。它们帮助我们表示我们几乎可以肯定、某事是可能的、不可能的，或预期中的。

She looks exhausted. She must be working too hard.
她看起来筋疲力尽。她一定是工作得太辛苦了。
He may have missed the train.
他可能没赶上火车。
They can’t be at home. All the lights are off.
他们不可能在家。所有的灯都关着。
His shoes are muddy. He must have been walking in the rain.
他的鞋子沾满了泥。他一定是在雨中走过。
The parcel should arrive tomorrow.
包裹应该会在明天到达。

Speculation and Deduction 形式

在这个主题中，我们根据确定程度以及我们谈论的是现在、当前正在进行的过程、过去的结果，还是持续到现在的活动来选择情态动词。 在大多数情态动词之后，我们使用不带 to 的动词原形。 这里主要的例外是ought to。 对于已经完成的过去动作，我们通常使用have + V3；对于过程，我们使用be + Ving或have been + Ving。

must + V1
must + be + adjective / noun / Ving
may / might / could + V1
may / might / could + be + adjective / noun / Ving
can’t / couldn’t + V1
can’t / couldn’t + be + adjective / noun / Ving
must / may / might / could / can’t / couldn’t + have + V3
must / may / might / could / can’t / couldn’t + have been + adjective / noun / Ving
should / ought to + V1
should / ought to + be + adjective / noun / Ving
should / ought to + have + V3

She must know the answer.
她一定知道答案。
They might be waiting outside.
他们可能在外面等着。
He can’t have forgotten your birthday.
他不可能忘了你的生日。
She must have been working all night.
她一定工作了一整夜。
The meeting should start soon.
会议应该很快就开始了。

Speculation and Deduction 规则

must = strong deduction
should / ought to = expectation
may / might / could = possibility
can’t / couldn’t = impossibility

  • Must 用于表示强烈的推断：我们几乎可以肯定某件事是真的，因为我们有证据或合乎逻辑的理由去相信它。这并不是 100% 的事实，但却是一个非常有把握的结论。
    Their car is outside. They must be at home.
    他们的车在外面。他们一定在家。
    She is out of breath. She must have been running.
    她上气不接下气。她一定是跑过来的。
  • 当某事是可能的，但我们并不确定时，会使用 may、might 和 could。通常，may 和 might 的意思非常接近，而 might 往往听起来稍微更不确定一些。Could 也经常表示可能性。
    The noise may be coming from the neighbours.
    噪音可能是邻居发出的。
    He might have left already.
    他可能已经离开了。
    It could be the wrong address.
    这可能是错误的地址。
  • 在肯定推断中，我们通常不使用can来表示“有可能”。我们通常改用could、may或might。Can更常用于疑问句、否定推断或对可能性的一般陈述。
    ❌ It can be John at the door.
    ✅ It could / may / might be John at the door.
  • Can’t 和 couldn’t 用于当我们认为某事是不可能的，或当我们表示强烈的不相信或惊讶时。对于现在的情况，can’t 更常用；对于过去，我们常用 can’t have + V3 或 couldn’t have + V3。
    You can’t be serious!
    你不是认真的吧！
    That couldn’t be right.
    那不可能是对的。
    Hannah can’t have said that. It doesn’t sound like her.
    汉娜不可能说过那样的话。这听起来不像她会说的话。
  • 如果我们谈论的是某件此刻正在发生、作为一个过程的事情， 我们经常在情态动词后使用 be + Ving。
    Amanda might be doing the dishes.
    阿曼达可能正在洗碗。
    He must be talking to the manager right now.
    他现在一定正在和经理说话。
  • 如果这种推断指的是过去已经完成的动作，我们通常使用have + V3。
    ✅ She must have forgotten the keys.
    ✅ They might have taken a taxi.
    ✅ He can’t have seen the message.
  • 如果我们想对一个一直持续到现在或过去某一时刻的活动作出推断，我们通常使用have been + Ving。
    Her hands are dirty. She must have been gardening.
    她的手很脏。她一定是在园艺。
    They look exhausted. They may have been travelling all night.
    他们看起来筋疲力尽。他们可能整夜都在赶路。
  • 在这个主题中，should 和 ought to 常用来表达一种预期： 我们认为根据计划、日程安排或正常情况，某事很可能是真的，或可能会发生。 Ought to 稍微更正式一些，也不那么常见。 重要提示：在其他语境中，should have + V3 也可以表达义务、建议或批评，而不是推断， 因此，像 by now、soon 或 tomorrow 这样的时间标记通常能让这种预期的含义更清楚。
    The train should be here by now.
    火车现在应该已经到了。
    They should have arrived by now.
    他们现在应该已经到了。
    The parcel ought to arrive tomorrow.
    包裹应该明天到达。
  • 对于较弱的否定可能性，我们使用may not和might not：换句话说，就是“也许不”。couldn’t通常表示不可能，而不只是较弱的可能性。
    ✅ There might not be enough food for everyone.
    ❌ There couldn’t be enough food for everyone. (if you only mean “maybe not”)
    He might not have seen your message yet.
    他可能还没看到你的消息。
  • Mustn’t 通常不用于表示推断。 它通常表示禁止。如果你想说某事 不可能，要用can’t，而不是mustn’t。
    ❌ He mustn’t be at home. (if you mean “that is impossible”)
    ✅ He can’t be at home.
    ✅ You mustn’t park here. (prohibition)
  • 除了情态动词外，推测也可以用其他词来表达：很可能、不太可能、肯定会、大概和肯定。
    She is likely to forget about the meeting.
    她很可能会忘记这次会议。
    That mistake was bound to happen sooner or later.
    那个错误迟早是会发生的。

Speculation and Deduction 否定

在这个主题中，否定形式取决于含义。 May not / might not = 某事不是真的，这是有可能的。 Can’t / couldn’t = 这是不可能的。 Shouldn’t 可以表达一种预期，即某事可能不对， 或者可能本来就不应该发生。 Mustn’t 通常表示禁止，而不是否定推断。

may not / might not + V1 / be + adjective / noun / Ving
can’t / couldn’t + V1 / be + adjective / noun / Ving
can’t / couldn’t + have + V3 / have been + Ving
shouldn’t + V1 / be + adjective / have + V3
mustn’t + V1 = prohibition

He may not know the address.
他可能不知道那个地址。
There might not be enough time.
可能没有足够的时间。
They can’t be waiting outside in this weather.
这种天气里，他们不可能还在外面等着。
She can’t have taken your bag. She wasn’t even here.
她不可能拿了你的包。她甚至都不在这里。
There shouldn’t be any problem now.
现在应该不会有任何问题了。
You mustn’t park here.
你不能把车停在这里。

Speculation and Deduction 问题

在关于推测的问题中，我们经常使用 can、could、should，以及像 Do you think ...? 这样的结构。 直接使用 might 的疑问句是可以的，但在日常对话中，它们通常听起来更正式或不太自然。 使用 must 的疑问句也可以，但它们通常听起来带有情绪色彩、像反问，或不那么中性。

Can / Could + subject + be + adjective / noun / Ving?
Could + subject + have + V3?
Wh-word + do you think + subject + may / might / could + V1 / have + V3?
Should + subject + V1 / be + adjective?

Could she be sleeping?
她会不会在睡觉？
Can he really be serious?
他真的是认真的吗？
What do you think might have happened here?
你觉得这里可能发生了什么？
Should they be here by now?
他们现在应该到这里了吗？
Do you think he could have missed the email?
你觉得他会不会没看到那封邮件？

Speculation and Deduction 常见错误

❌ She must to be tired.
✅ She must be tired.
❌ He must has left.
✅ He must have left.
❌ They can’t have went home.
✅ They can’t have gone home.
❌ She mights be busy.
✅ She might be busy.
❌ It can be John at the door.
✅ It could / may / might be John at the door.
❌ He mustn’t be at home. (if you mean “that is impossible”)
✅ He can’t be at home.
❌ He mustn’t have forgotten the meeting. (if you mean “that is impossible”)
✅ He can’t have forgotten the meeting.
❌ They should came by now.
✅ They should have come by now.

Speculation and Deduction 句子

She isn’t answering. She might be having a meeting.
她没接电话。她可能正在开会。
Look at the wet street. It must have rained.
看看这条湿漉漉的街道。一定下过雨了。
This key can’t be the right one.
这把钥匙不可能是对的。
They may have taken the earlier bus.
他们可能乘坐了早一点的公交车。
The children are quiet. They must be sleeping.
孩子们很安静。他们一定是睡着了。
He could be working from home today.
他今天可能在家办公。
The guests should arrive around eight.
客人大约应该在八点左右到达。
You can’t have seen Anna there. She is abroad.
你不可能在那里见过安娜。她在国外。
There might not be enough chairs for everyone.
可能没有足够的椅子给每个人坐。
Do you think he might know the answer?
你觉得他可能知道答案吗？
She looks sunburnt. She must have been sitting outside all afternoon.
她看起来晒伤了。她整个下午肯定一直坐在外面。
The package ought to be here by Friday.
包裹应该会在周五之前送到这里。

Speculation and Deduction 例子

The office is dark, so they must have left already.
办公室里一片漆黑，所以他们肯定已经离开了。
Sarah might be waiting for us downstairs.
莎拉可能正在楼下等我们。
That sound could be coming from the kitchen.
那个声音可能是从厨房传来的。
He can’t be the new intern. He introduced himself as the manager.
他不可能是新来的实习生。他自我介绍时说自己是经理。
The flight should land in about twenty minutes.
航班大约会在二十分钟后降落。
She may not have understood what you meant.
她可能没有理解你的意思。
They could have forgotten to lock the door.
他们可能忘了锁门。
It is unlikely to snow here in April.
这里四月下雪的可能性不大。
This problem was bound to happen after the update.
这个问题在更新后注定会发生。
Could he still be driving home?
他还在开车回家吗？
Her hands are dirty. She must have been gardening.
她的手很脏。她一定是在园艺。
There shouldn’t be much traffic at this time of night.
这个时间的晚上应该不会有太多车。

应用中提供的英语语法练习

Tenses

Future Simple Present Simple Present Perfect Present Continuous Past Simple Past Perfect Past Continuous Past Perfect Continuous Present Perfect Continuous Future Continuous Future Perfect Future Perfect Continuous Be going to

Adjectives/Adverbs

Superlatives Comparatives

Conditionals

Second Conditional First Conditional Third Conditional Zero Conditional

Sentences

Relative Clauses Conjunctions Reported Speech There is / There are There was / There were

Verbs

Used to To be used to To get used to

Modals

Should or Shouldn't May or Might and Infinitive Modal Verbs Can / Can't Speculation and Deduction

Nouns and Articles

Countable and Uncountable Singular and Plural Nouns Uncountable and Plural