Expressing 'Have To': The Colloquial `得 (děi)`
得 (děi) for informal, everyday obligations, and remember its negative is 不用 (búyòng).
Grammar Rule in 30 Seconds
Use {得|děi} to express 'must' or 'have to' in everyday spoken Chinese.
- Use {得|děi} before a verb to show necessity: 我{得|děi}走 (I have to go).
- The negative form is {不用|bùyòng} or {没必要|méibìyào}, never {不得|bùděi}.
- It is strictly for spoken, informal contexts; avoid it in formal writing.
Overview
In Mandarin Chinese, expressing obligation is a nuanced task. While you may have learned formal words for "must," the most common and practical way to say you "have to" do something in everyday speech is by using the modal verb 得 (děi). Pronounced děi, this character signifies a necessity or obligation arising from external circumstances.
It's the voice of practicality, not of stern command.
Think of 得 (děi) as the bridge between a situation and the action it requires. Your phone is at 1% battery; 你得充电 (nǐ děi chōngdiàn) (you have to charge it). The last train is leaving; 我们得走了 (wǒmen děi zǒu le) (we have to go).
This verb is fundamentally colloquial, making it essential for sounding natural in conversations, but generally inappropriate for formal or academic writing. Its core function is to place a verb under the pressure of a present or future necessity. Mastering 得 (děi) involves understanding not only its usage but also its crucial distinction from its negative form and other words that convey obligation, like the more forceful 必须 (bìxū).
It is also critical to distinguish 得 (děi) by its unique pronunciation. The same character 得 has other pronunciations and meanings, such as dé (to get, to obtain) and de (a structural particle for complements). When you hear děi before a verb, it is an unambiguous signal for the modal verb of necessity.
How This Grammar Works
得 (děi) is the concept of external imposition. Unlike a desire (想 xiǎng) or a personal intention (要 yào), 得 (děi) implies that the reason for the action comes from outside the speaker's will. The obligation is not a moral duty or a deeply held conviction, but a practical response to a situation.太晚了，我得回家了 (Tài wǎn le, wǒ děi huíjiā le), meaning "It's too late, I have to go home," the necessity (得回家) is imposed by the time (太晚了). No one is issuing a command, but the circumstances demand the action. This reliance on context is a core feature of 得 (děi).得 (děi) is its negative form. You cannot negate 得 (děi) with 不 (bù). The phrase 不 děi is grammatically incorrect and will immediately mark you as a learner.不用 (búyòng) or, less commonly, 不必 (búbì). The logic here is that 得 (děi) establishes a necessity, and 不用 (búyòng), which literally means "no need to use," effectively cancels that necessity. For example: 今天不用上班 (Jīntiān búyòng shàngbān) (I don't have to go to work today).不得 (bùdé), which is a formal prohibition meaning "must not" or "may not." It appears on signs and in regulations, such as 游客不得触摸展品 (Yóukè bùdé chùmō zhǎnpǐn) (Visitors must not touch the exhibits). Confusing 不用 with 不得 can lead to significant misunderstandings, shifting your meaning from a simple lack of obligation to a strict and authoritative ban.Formation Pattern
得 (děi) correctly requires adherence to a few clear syntactical patterns. The structure changes depending on whether the statement is affirmative, negative, or a question.
得 (děi) before the verb or verb phrase that is required.
得 (děi) + Verb (Phrase) | 我明天得早起。 | Wǒ míngtiān děi zǎoqǐ. (I have to get up early tomorrow.) |
得 (děi) + Verb (Phrase) | 你得去跟老板谈谈。 | Nǐ děi qù gēn lǎobǎn tántan. (You have to go talk to the boss.) |
得 (děi) is replaced entirely. Never use 不 (bù).
不用 (búyòng) + Verb | 你不用担心我。 | Nǐ búyòng dānxīn wǒ. (You don't have to worry about me.) |
不必 (búbì) + Verb | 时间还早，你不必着急。 | Shíjiān hái zǎo, nǐ búbì zhāojí. (It's still early, you don't have to rush.) |
不用 (búyòng) is far more common in spoken Chinese. 不必 (búbì) sounds slightly more formal and is closer to "it is not necessary that..."
得 (děi) + Verb + 吗 (ma)? | 我们得现在走吗？ | Wǒmen děi xiànzài zǒu ma? (Do we have to leave now?) |
用不用 (yòngbuyòng) + Verb? | 我用不用买票？ | Wǒ yòngbuyòng mǎi piào? (Do I need to buy a ticket or not?) |
用不用 (yòngbuyòng) is extremely common and often preferred over the 吗 (ma) question, as it sounds more natural and conversational.
得 (děi) to mean "require" or "need"
得 (děi) can also be used to state that a task requires a certain amount of time, money, or effort. In this structure, it is followed by a quantity, not an action verb.
得 (děi) + [Time/Effort/Cost] | 这个项目得三个月才能做完。 | Zhège xiàngmù děi sān ge yuè cái néng zuòwán. (This project needs three months to be completed.) |
得 (děi) + [Time/Effort/Cost] | 修好这台电脑得花不少钱。 | Xiūhǎo zhè tái diànnǎo děi huā bùshǎo qián. (Fixing this computer will cost a good deal of money.) |
When To Use It
得 (děi) is versatile and appears in many contexts where an external factor compels an action. You should use it in the following situations:- Responding to a situation or environment: When a change in your surroundings creates a need. It starts raining, so
我得带伞 (wǒ děi dài sǎn)(I have to bring an umbrella). The fridge is empty, so我得去超市 (wǒ děi qù chāoshì)(I have to go to the supermarket).
- Appointments, plans, and deadlines: For obligations dictated by a schedule.
我下午三点得去开会 (Wǒ xiàwǔ sān diǎn děi qù kāihuì)(I have to go to a meeting at 3 PM).这个周末我得加班 (Zhège zhōumò wǒ děi jiābān)(I have to work overtime this weekend).
- Logical necessity or preconditions: When one action is a necessary condition for achieving a goal.
你想通过考试，就得多复习 (Nǐ xiǎng tōngguò kǎoshì, jiù děi duō fùxí)(If you want to pass the exam, you have to review more). This often appears inif...thenconstructions.
- Following rules or procedures: For informal rules or steps that must be followed. For example, when a food delivery app states a minimum for free delivery, you might say,
我还得再买一个东西 (Wǒ hái děi zài mǎi yí ge dōngxi)(I still have to buy one more thing).
- Giving reluctant advice or expressing resigned necessity: When you acknowledge an obligation with a sigh. Your friend is sick, and you advise,
那……你得去看医生啊 (Nà... nǐ děi qù kàn yīshēng a)(Well... then you have to go see a doctor). It conveys that this is the only logical course of action, even if it's undesirable.
Common Mistakes
得 (děi). Avoiding these mistakes will significantly improve your fluency.不 děi Negation Error不 děi. It is fundamentally ungrammatical in Mandarin. Always replace it with 不用 (búyòng) or 不必 (búbì).我明天不 děi 上班。 | 我明天不用上班。 | I don't have to work tomorrow. |你现在不 děi 走。 | 你现在不用走。 | You don't have to leave now. |děi, de, dé)得 has multiple pronunciations that serve entirely different grammatical functions. Confusing them is a classic intermediate-level pitfall.得 | děi | Modal Verb (have to) | Before a verb | 我得走了。 (I have to go.) |的 | de | Attributive particle (possessive, descriptive) | After a noun/adjective | 我的书。 (My book.) |地 | de | Adverbial particle | After an adverb, before a verb | 他慢慢地说。 (He spoke slowly.) |得 | de | Structural particle (complement of degree) | After a verb | 你跑得太快了。 (You run too fast.) |得 | dé | Verb (to get, to obtain) | As a main verb | 我得到了一个机会。 (I got an opportunity.) |得 (děi) for Past Obligations得 (děi) points to a present or future necessity. To talk about something you had to do in the past, you must use a different structure. The most common is 不得不 (bùdébù), which means "had no choice but to."我昨天 děi 加班。 | 我昨天不得不加班。 | I had no choice but to work overtime yesterday. |得 (děi) vs. 必须 (bìxū)得 (děi): Informal, colloquial, external circumstance. It's for life's practical necessities. (e.g.,我得去买菜- I have to go buy groceries.)必须 (bìxū): Formal, strong, non-negotiable command or duty. It implies authority and seriousness. Using it in a casual context can sound overly dramatic. (e.g.,你必须遵守法律- You must obey the law.)
Real Conversations
To understand 得 (děi) fully, observe its use in natural dialogue.
Scenario 1
- A: 晚上一起看电影吗？新出的那个。(Wǎnshang yīqǐ kàn diànyǐng ma? Xīn chū de nàge.)
(Want to watch a movie tonight? That new one.)
- B: 去不了啊，我明天有个考试，今晚得通宵复习了。(Qù bu liǎo a, wǒ míngtiān yǒu ge kǎoshì, jīnwǎn děi tōngxiāo fùxí le.)
(Can't make it. I have an exam tomorrow, so I have to pull an all-nighter to study tonight.)
Scenario 2
- Manager: 这个报告客户催得很紧。(Zhège bàogào kèhù cuī de hěn jǐn.)
(The client is really pushing for this report.)
- Employee: 明白，那我今天得加个班把它赶出来。(Míngbai, nà wǒ jīntiān děi jiā ge bān bǎ tā gǎn chūlai.)
(Understood. In that case, I'll have to work overtime today to rush it out.)
Scenario 3
- A: 从北京到上海坐高铁得多久？(Cóng Běijīng dào Shànghǎi zuò gāotiě děi duōjiǔ?)
(How long does it take to get from Beijing to Shanghai by high-speed rail?)
- B: 差不多得五个小时吧。(Chàbuduō děi wǔ ge xiǎoshí ba.)
(It takes about five hours.)
Here, 得 (děi) is used to mean "requires" a certain amount of time.
Quick FAQ
得 (děi) and 要 (yào)?This is a subtle but important distinction. 要 (yào) can mean "to want," "to be going to," or a soft "need to." It often expresses intention or a future plan. 我要去银行 (Wǒ yào qù yínháng) can mean "I want to go..." or "I am going to..." 我得去银行 (Wǒ děi qù yínháng) specifically means "I have to go to the bank," implying an external reason, like needing to pay a bill before a deadline.
得 (děi) vs. 应该 (yīnggāi)?应该 (yīnggāi) means "should" and gives advice or expresses a moral or logical expectation. 你应该多喝水 (Nǐ yīnggāi duō hē shuǐ) is a suggestion ("You should drink more water"). 你得多喝水 (Nǐ děi duō hē shuǐ), however, sounds like a doctor's order ("You have to drink more water"). 应该 is a recommendation; 得 is a practical command.
得 (děi)?Adverbs of time, sequence, or manner usually go before 得 (děi). For example, 我得先完成工作 (Wǒ děi xiān wánchéng gōngzuò) (I have to finish work first). Or, 我们也得去 (Wǒmen yě děi qù) (We also have to go).
用不用 is the common way to ask a question. Is 得不得 (děi bu děi) ever used?While grammatically plausible, 得不得 is very rare in most parts of China and sounds unnatural to most native speakers. 用不用 is the standard and idiomatic choice for A-not-A questions about necessity. Stick with 用不用 to ensure you are understood clearly.
得 (děi) be followed by an abstract noun?Yes, this is a common usage, especially when it means "to require." For example, 做这件事得有耐心 (Zuò zhè jiàn shì děi yǒu nàixīn) (Doing this thing requires patience). Here, the structure is 得 (děi) + have + [abstract quality].
Formation of {得|děi} Sentences
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subj + 得 + Verb
|
我得走
|
|
Negative
|
Subj + 不用 + Verb
|
你不用走
|
|
Question
|
Subj + 得 + Verb + 吗?
|
你得走吗?
|
|
Emphasis
|
Subj + 真得 + Verb
|
我真得走
|
|
Time-based
|
Time + Subj + 得 + Verb
|
明天我得走
|
Meanings
A modal verb used to indicate obligation, necessity, or a strong requirement in spoken Mandarin.
Obligation
Expressing that an action is necessary or required.
“我{得|děi}回家。 (I have to go home.)”
“你{得|děi}听我说。 (You have to listen to me.)”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subj + 得 + Verb
|
我得去
|
|
Negative
|
Subj + 不用 + Verb
|
你不用去
|
|
Question
|
Subj + 得 + Verb + 吗?
|
他得去吗?
|
|
Short Answer (Yes)
|
得
|
得
|
|
Short Answer (No)
|
不用
|
不用
|
|
Modal + Time
|
Subj + 得 + Time + Verb
|
我得明天去
|
Formality Spectrum
我必须离开。 (Leaving a social gathering)
我需要走。 (Leaving a social gathering)
我得走。 (Leaving a social gathering)
我得撤了。 (Leaving a social gathering)
Necessity Modals
Informal
- 得 have to
Formal
- 必须 must
Examples by Level
我{得|děi}走。
I have to go.
你{得|děi}吃。
You have to eat.
他{得|děi}去。
He has to go.
我们{得|děi}看。
We have to see.
我{得|děi}去{买东西|mǎidōngxi}。
I have to go shopping.
你{得|děi}早点儿{睡觉|shuìjiào}。
You have to sleep earlier.
明天我{得|děi}去{工作|gōngzuò}。
I have to work tomorrow.
我们{得|děi}快点儿。
We have to hurry.
这{件事|jiànshì}你{得|děi}问问他。
You have to ask him about this matter.
我{得|děi}把这个{做完|zuòwán}。
I have to finish this.
你{不用|bùyòng}这么{着急|zháojí}。
You don't have to be so anxious.
他{得|děi}去{医院|yīyuàn}看看。
He has to go to the hospital to check.
你{得|děi}明白，这{不是|bùshì}小事。
You have to understand, this isn't a small matter.
我们{得|děi}想个{办法|bànfǎ}。
We have to think of a way.
你{不用|bùyòng}太{在意|zàiyì}他的话。
You don't have to care too much about his words.
我{得|děi}先去{处理|chǔlǐ}一下。
I have to go handle this first.
这{种情况|zhǒngqíngkuàng}下，你{得|děi}学会{变通|biàntōng}。
In this situation, you have to learn to be flexible.
你{得|děi}知道，{机会|jīhuì}不多了。
You have to know, there aren't many opportunities left.
没必要{这么|zhème}做，你{不用|bùyòng}太{累|lèi}。
No need to do it this way, you don't have to be so tired.
他{得|děi}为自己的{行为|xíngwéi}负责。
He has to be responsible for his actions.
在{这种|zhèzhǒng}环境下，你{得|děi}学会{适应|shìyìng}。
In this environment, you have to learn to adapt.
你{得|děi}明白，{有些事|yǒuxiēshì}是{命中注定|mìngzhōngzhùdìng}的。
You have to understand, some things are fated.
你{不用|bùyòng}太{纠结|jiūjié}，{顺其自然|shùnqízìrán}吧。
You don't have to overthink it, just let it be.
我们{得|děi}在{有限|yǒuxiàn}的{时间|shíjiān}内{完成|wánchéng}。
We have to finish within the limited time.
Easily Confused
Both mean 'must', but learners don't know when to use which.
Same character, different pronunciation and function.
Same character, different pronunciation and meaning.
Common Mistakes
我不得去
我不用去
我得得去
我得去
得我走
我得走
我得去学校吗？
我得去学校吗？
他不得吃
他不用吃
我得去写作业吗？
我得写作业吗？
得我做
我得做
我不得已去
我不得不去
你得不需要去
你不需要去
得去吗？
你得去吗？
这事儿得必须做
这事儿得做
我不觉得得去
我觉得不用去
得去吧？
得去吗？
得不用去
不用去
Sentence Patterns
我___去___。
你___担心，我___处理。
为了___，我们___早点儿出发。
虽然___，但我___坚持下去。
Real World Usage
我得走了，回头聊！
我得加个蛋。
这电影我得看！
我得去买票。
我得说明一下我的背景。
我得备注一下不要辣。
The 'Gotta' Rule
No 'Not'
Keep it Spoken
Dialect Variation
Smart Tips
Don't use '不' + '得'. Use '不用'.
Swap '得' for '必须'.
Use '不得不' instead of just '得'.
Remember: 'děi' is for 'must'.
Pronunciation
Tone
The character 得 in this context is pronounced with a third tone (děi).
Urgency
我得走！ (Falling-rising)
Conveys a sense of immediate necessity.
Memorize It
Mnemonic
Think of {得|děi} as 'Day'—you have to do things every day!
Visual Association
Imagine a person running to catch a bus, shouting '得! 得!' (Gotta! Gotta!) as they sprint.
Rhyme
In the street, keep it neat, use {得|děi} for your feet.
Story
Xiao Wang is late. He says, '我{得|děi}走!' (I have to go). His friend says, '你{不用|bùyòng}急' (You don't have to rush). Xiao Wang replies, '我{得|děi}快点儿' (I have to be fast).
Word Web
Challenge
For the next 5 minutes, narrate your actions using '我{得|děi}...' (e.g., 我{得|děi}喝水, 我{得|děi}打字).
Cultural Notes
Very common in daily life, especially in Beijing dialect where it is used constantly.
Used, but sometimes speakers prefer '要' or '必须' depending on the generation.
Often carry over the 'must' usage from Cantonese into Mandarin.
Originally meant 'to obtain' (dé). Through semantic shift, it evolved to mean 'what one must obtain/do'.
Conversation Starters
你今天得做什么？
你得去超市吗？
如果很忙，你得怎么安排？
你觉得现代人得学会什么技能？
Journal Prompts
Common Mistakes
Test Yourself
我___去开会。
我___去。
Find and fix the mistake:
我不得去。
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
I have to eat.
Answer starts with: 我得吃...
Which is formal?
你___担心，一切都会好的。
我得走。
Score: /8
Practice Exercises
8 exercises我___去开会。
我___去。
Find and fix the mistake:
我不得去。
走 / 我 / 得
I have to eat.
Which is formal?
你___担心，一切都会好的。
我得走。
Score: /8
Practice Bank
12 exercisesA: 你要去看电影吗？ B: 不行，我 ___ 写完我的报告。
下个星期是妈妈的生日，我 ___ 给她买个礼物。
A: 我们今晚去吃火锅吧！ B: 好啊，不过我 ___ 先回家放东西。
明天是周末，我们不学习。
老师说，我们明天必须交作业。所以我今晚必须得写。
I have to finish this work by 5 o'clock.
You don't need to pay.
How do you ask 'Do I have to bring my passport?'
A: 谢谢你的帮助！ B: 没事，___ 客气。
Score: /12
FAQ (8)
No, it is too informal. Use {必须|bìxū} or {需要|xūyào} instead.
Because {不得|bùděi} has a different meaning (forbidden/cannot). Use {不用|bùyòng} for 'don't have to'.
No, they are different. {得|děi} is a modal, {得|de} is a particle.
Yes, e.g., '我明天得去'.
It is standard in Mandarin, but usage varies in other dialects.
Use {不得不|bùdébù}.
Yes, '你得去吗？'.
Yes, in this modal context.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
tener que
Spanish conjugates the verb; Chinese {得|děi} does not.
devoir
French 'devoir' is highly formal and conjugates; {得|děi} is strictly informal.
müssen
German 'müssen' conjugates for person; {得|děi} is invariant.
なければならない
Japanese is agglutinative; Chinese is isolating.
يجب (yajib)
Arabic 'yajib' is impersonal; {得|děi} is personal.
必须 (bìxū)
{得|děi} is colloquial; {必须|bìxū} is formal.
Learning Path
Prerequisites
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