Grammar Rule in 30 Seconds
Use the base form of a verb after words of necessity or suggestion to sound professional and precise.
- Use the base verb (no -s, -ed, or -ing) regardless of the subject: 'It is vital he attend.'
- For negative sentences, place 'not' directly before the verb: 'I suggest she not go.'
- The verb 'to be' always becomes 'be': 'It is essential that you be ready.'
Overview
It is essential that she be informed 这样的句子。等等，she be？不是 she is 吗？作者忘了怎么用 to be 动词了吗？不。你刚刚遇到了虚拟语气（Subjunctive Mood）。具体来说，是命令性虚拟语气。这就像是为了 Zoom 面试特意穿上西装打上领带的语言版本。它正式、精确，在高水平的学术和职场英语中出奇地常见。它让你能够表达紧迫性、重要性或要求，而听起来不像是仅仅在陈述一个无聊的事实。这就像是说“门关着”和“门必须保持关闭”之间的区别。前者是陈述；后者是包裹在天鹅绒手套里的命令。把它想象成高级英语使用者的秘密握手。如果你用对了，你会显得非常有修养。如果你用错了，你听起来就像个普通人，这也没什么不好，但我们追求的是 C1 级别的卓越！How This Grammar Works
It is essential that... 时，你并不是在说某件事正在发生。你是在说它 *需要* 发生。因为动作实际上还没有发生，所以动词保持其最基本、最纯粹的形式。就像动词呆在候务室里，准备行动但尚未承诺具体的时间或人物。这种“可能性”的氛围正是虚拟语气的定义所在。这就是为什么我们在第三人称单数时去掉 s，以及为什么 am/is/are 都变回了它们的祖先：be。这有点像极简主义设计趋势；我们剥离了时态和主谓一致这些不必要的装饰，以专注于核心要求。只是别在酒吧点汉堡时试着用这个；你会收到非常困惑的目光。
Formation Pattern
It is + 表示重要性的形容词（如 essential, vital, crucial, important, mandatory 或 imperative）开头。
that + 主语 + 动词的 原形。
It is vital...
that：It is vital that...
It is vital that the CEO...
s, ed, ing）：It is vital that the CEO attend the meeting.
be here. | 他必须在场。
not leave. | 她千万不能离开。
be fixed. | 必须修理好它。
don't 或 doesn't。我们只需在动词前放一个 not。它干净、利落，让你看起来像个语法专家。
When To Use It
- 工作邮件： 当你给老板或客户发邮件，需要显得专业且坚定。
It is essential that the report be submitted by Friday. - 正式写作： 论文、研究报告或求职信。
It is imperative that the data be verified. - 法律或官方场合： 阅读租赁协议或政府网站。
It is mandatory that all tenants provide proof of insurance. - 医疗或安全建议： 当指令关乎生死。
It is vital that the patient remain still during the scan.
Common Mistakes
he works 或 she goes 了，以至于写下 It is essential that he work 时大脑会尖叫。感觉不对劲，就像看到了 Matrix 里的漏洞。但在虚拟语气中，那个 s 就是敌人。- 错误：
It is important that he stays. - 纠正：
It is important that he stay.
to be 动词。人们经常想用 is 或 are。- 错误：
It is essential that she is present. - 纠正：
It is essential that she be present.
should（尽管 should 在英式英语中很常见）。Contrast With Similar Patterns
It is... 句子有什么不同？归根结底是事实与要求的区别。- 直陈语气（事实）：
It is clear that he is happy.（我们陈述一个观察到的事实）。 - 虚拟语气（要求）：
It is essential that he be happy.（我们要求一种条件）。
Quick FAQ
that 吗？that。should：It is essential that he should be there。It was essential that...，后面的动词仍然保持原形！Subjunctive vs. Indicative Comparison
| Subject | Indicative (Fact) | Subjunctive (Requirement) | Negative Subjunctive |
|---|---|---|---|
|
I
|
I am / I work
|
that I be / that I work
|
that I not be / that I not work
|
|
You
|
You are / You work
|
that you be / that you work
|
that you not be / that you not work
|
|
He/She/It
|
He is / He works
|
that he be / that he work
|
that he not be / that he not work
|
|
We
|
We are / We work
|
that we be / that we work
|
that we not be / that we not work
|
|
They
|
They are / They work
|
that they be / that they work
|
that they not be / that they not work
|
Meanings
A special verb form used in 'that' clauses to express a requirement, suggestion, or necessity. It uses the base form of the verb for all subjects.
Expressing Necessity
Used after adjectives like essential, vital, or mandatory to show something must happen.
“It is vital that he remain calm.”
“It is mandatory that the witness testify.”
Making Suggestions
Used after verbs like suggest, recommend, or propose.
“I suggest that he take a taxi.”
“We recommend that she apply early.”
Demands and Requests
Used after verbs like demand, insist, or request.
“The judge demanded that he pay the fine.”
“She insisted that he not leave.”
Reference Table
| 触发短语 | 正确示例 | 错误示例 |
|---|---|---|
|
It is essential that...
|
It is essential that he *arrive* on time.
|
It is essential that he *arrives* on time.
|
|
I demand that...
|
I demand that she *apologize*.
|
I demand that she *apologizes*.
|
|
They recommend that...
|
They recommend that he *take* a break.
|
They recommend that he *takes* a break.
|
|
We insist that...
|
We insist that the rules *be* followed.
|
We insist that the rules *are* followed.
|
|
It is crucial that...
|
It is crucial that you *not forget*.
|
It is crucial that you *don't forget*.
|
|
The law requires that...
|
The law requires that everyone *comply*.
|
The law requires that everyone *complies*.
|
|
She proposed that...
|
She proposed that we *start* early.
|
She proposed that we *should start* early.
|
正式程度
It is essential that you be punctual. (Workplace attendance)
It's important that you're on time. (Workplace attendance)
You gotta be on time. (Workplace attendance)
Don't be late, fam. (Workplace attendance)
命令式虚拟语气网络图
触发动词
- Suggest I suggest that he *go*.
- Recommend They recommend that she *rest*.
- Insist We insist that you *listen*.
- Demand He demands that they *pay*.
触发形容词/名词
- Essential It is essential that we *start*.
- Crucial It is crucial that she *be* there.
- Important It is important that he *know*.
- Requirement It's a requirement that all *sign*.
核心规则
- 动词原型 主语 + `that` + 主语 + 动词原型.
- 无-s He *go*, She *be*, It *rain*.
- 否定形式 主语 + `that` + 主语 + `not` + 动词原型.
命令式虚拟语气 vs. 陈述语气
现在是命令式虚拟语气时间吗？
句子是否表达了命令、建议、推荐或必要性？
它是否使用了触发动词（例如，suggest, demand）或形容词（例如，essential, vital）后跟'that'？
'that'从句中的动词是否是原型（不带'to'的动词不定式），即使主语是'he/she/it'？
虚拟语气语境与关键动词
正式指令
- • It is required that...
- • The law stipulates that...
- • Official policy dictates that...
强烈建议
- • I suggest that...
- • We recommend that...
- • They proposed that...
必要性/紧急性
- • It is vital that...
- • It is crucial that...
- • It is imperative that...
动词原型形式
- • (that she) go
- • (that he) be
- • (that it) rain
- • (that they) not forget
按水平分级的例句
It is important that he be happy.
It is important that he is happy.
I suggest you go now.
I think you should go now.
It is vital that we eat.
We must eat.
She asks that he help.
She wants him to help.
It is essential that she not cry.
She must not cry.
I recommend that he study more.
He should study more.
The doctor suggests that he rest.
The doctor says he needs rest.
It is necessary that you be there.
You have to be there.
I insist that he pay for the window.
I am demanding that he pays for the window.
It is vital that the water be clean.
The water must be clean.
They requested that we not smoke here.
They asked us not to smoke.
We propose that the meeting start at 9.
We suggest starting at 9.
It is mandatory that every passenger wear a seatbelt.
Everyone must wear a seatbelt.
The committee recommended that the law be changed.
The committee said the law should change.
I suggest that he not be told the truth yet.
Don't tell him the truth yet.
It is crucial that the evidence remain untouched.
The evidence must stay as it is.
It is imperative that the CEO be apprised of these developments.
The CEO must be informed.
The treaty stipulates that no nation deploy weapons in space.
The treaty says no weapons in space.
I move that the session be adjourned until tomorrow.
I suggest we stop the meeting.
It is essential that she not succumb to pressure.
She must not give in to pressure.
Lest the public be misled, it is vital that the data be released in full.
To prevent misleading the public, release the data.
The prosecution requested that the defendant remain in custody.
The lawyer asked to keep him in jail.
It is of the utmost importance that the integrity of the process be maintained.
The process must stay honest.
The decree mandated that all citizens be registered by year's end.
The law said everyone must register.
容易混淆
Learners mix up 'insist that he is' (stating a fact) and 'insist that he be' (making a demand).
Learners don't know when to use 'should' vs the bare verb.
Learners think the second verb must be past tense if the first one is.
常见错误
It is important that he is here.
It is important that he be here.
I suggest he goes.
I suggest he go.
It is vital you to come.
It is vital that you come.
She asks he help.
She asks that he help.
I recommend he doesn't go.
I recommend he not go.
It is necessary that he stays.
It is necessary that he stay.
They suggest we are ready.
They suggest we be ready.
He insisted that I was there.
He insisted that I be there.
It is essential that she has a passport.
It is essential that she have a passport.
I propose that the plan is changed.
I propose that the plan be changed.
It is imperative that he not be being late.
It is imperative that he not be late.
I suggest that he should go.
I suggest that he go.
The rule mandates that everyone is registered.
The rule mandates that everyone be registered.
It is vital that he not fails.
It is vital that he not fail.
句型
It is essential that ___ ___.
I suggest that ___ not ___.
The board requested that the report ___ ___.
It is imperative that ___ be ___.
Real World Usage
I suggest that the company explore new markets.
It is required that the tenant maintain the property.
I recommend that he take this medication twice daily.
We propose that the experiment be repeated.
It is vital that you be present at the gala.
The council demands that the ceasefire be respected.
识别触发词
suggest, recommend, insist, demand, request, propose这些动词，或者
essential, crucial, important, vital, imperative这些形容词后面跟着
that 从句。它们是命令式虚拟语气的信号灯！It is essential that he *arrive* on time.
别加'S'！
that he *go*，而不是 that he goes。否定句的威力
It is crucial that you *not procrastinate*，比 that you don't procrastinate 听起来更直接、更正式。只用于正式场合
We request that you submit your application by Friday.
练习'To Be'
It is necessary that he *be* informed 是正确的，而不是 'is informed' 或 'will be informed'。Smart Tips
Immediately check the next verb. If it has an 's' or 'ed', it's probably a mistake!
Use 'It is vital that...' instead of 'You must...' to sound more polite and sophisticated.
Forget 'am, is, are'. Just use 'be'. It's the easiest part of the rule once you get used to it.
Just put 'not' before the verb. No 'don't', no 'doesn't', no drama.
发音
Stress on Trigger
In sentences like 'It is VITAL that he go,' the stress usually falls heavily on the trigger word to emphasize the necessity.
The 'That' Reduction
The word 'that' is often reduced to a quick /ðət/ sound, or even omitted in speech, though the subjunctive verb remains.
Falling Intonation for Commands
I insist that he stay. ↘
Conveys authority and finality.
记住它
记忆技巧
Remember: 'Subjunctive is Bare.' It uses the bare verb with no clothes (no -s, no -ed, no -ing).
视觉联想
Imagine a judge pointing a finger and saying 'I demand...' Behind the judge is a giant 'BE' sign, reminding you that 'is/am/are' are banned in his court.
Rhyme
When 'essential' is the word, the 's' is never heard.
Story
A strict boss named Mr. Essential always demands that his employees 'be' on time. He hates the letter 'S', so he fired it from all his verbs. Now, he says 'He work' and 'She stay' instead of 'He works' and 'She stays'.
Word Web
挑战
Write three professional emails using 'I suggest that...', 'It is vital that...', and 'We recommend that...' without using the word 'should'.
文化笔记
The mandative subjunctive is much more common in the US than in the UK. Americans use it in both formal and semi-formal speech.
Brits often prefer using 'should' or the indicative. The bare subjunctive can sound slightly archaic or extremely formal to a British ear.
In international law and contracts, the subjunctive is the standard to avoid ambiguity about whether something is a fact or a requirement.
The subjunctive mood comes from Proto-Indo-European and was highly developed in Old English with specific endings for different persons.
对话开场白
What is one rule in your country that you think is essential that everyone follow?
If you were the boss, what would you suggest that your employees do differently?
In a relationship, is it vital that partners share the same hobbies?
The government is proposing a new law. What do you recommend that they include?
日记主题
常见错误
Test Yourself
It is urgent that she ___ the documents by noon.
Find and fix the mistake:
The board demanded that he attends all future meetings.
Translate into English: 'Es esencial que ella esté aquí a tiempo.'
Answer starts with: ["I...
Score: /3
练习题
8 exercisesIt is essential that he ___ ready by 8 AM.
Which sentence is grammatically correct?
Find and fix the mistake:
The manager insisted that the report is finished today.
It is vital that ___.
In the subjunctive mood, the verb changes if the subject is 'he' or 'she'.
A: 'The deadline is tomorrow.' B: 'Then it is imperative that he ___ the project tonight.'
Select the trigger words.
1. Demand, 2. Recommend, 3. Crucial
Score: /8
Practice Bank
11 exercisesThe university requires that every student ___ an ethics course.
It is important that she arrives at the airport two hours early.
Choose the correct sentence:
Translate into English: 'El médico recomendó que ella descanse.'
Arrange these words into a sentence:
Match the beginning of the sentence with the correct subjunctive verb phrase:
The coach insisted that the team ___ extra practice.
It was proposed that the company opens a new branch.
Choose the correct sentence:
Translate into English: 'Es vital que no olvides el código.'
Arrange these words into a sentence:
Score: /11
常见问题 (8)
Not at all! While some forms are rare, the mandative subjunctive (after 'essential', 'suggest') is actually very common in formal American English and professional writing.
Yes, especially in British English. 'It is essential that he should go' is correct. However, the bare form 'It is essential that he go' is more formal.
The verb 'suggest' cannot be followed by an object + infinitive. You must use a 'that' clause, which then triggers the subjunctive.
No. The mandative subjunctive always uses the base form, even if you are talking about the past: 'I suggested that he be there.'
In formal writing, yes. In casual speech, people often drop it: 'I suggest he go.' But for C1 level exams, keep the 'that'.
'Insist he is' means you are stating a fact ('I insist he is innocent'). 'Insist he be' is a command ('I insist he be released').
No. 'Hope' is not a mandative trigger. We say 'I hope that he goes' (indicative).
It's rare, but possible: 'Is it not essential that he be informed?' The rules remain the same.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Presente de Subjuntivo
Spanish conjugates for every person, while English uses one base form for all.
Le Subjonctif
French has many irregular subjunctive stems, whereas English is always the base form.
Konjunktiv I
German Konjunktiv I is mostly for indirect speech, not just mandates.
~koto ga hitsuyou
Japanese has no verb mood change; it uses helper words at the end of the sentence.
Al-Mudari' al-Mansub
Arabic changes the final vowel of the verb, while English changes the whole conjugation pattern.
yào / bìxū
Chinese has no verb conjugation at all, so the concept of a 'mood' is purely lexical.
Learning Path
Prerequisites
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