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Chinese grammar - 'Must' or 'have to' with 得 (děi)

'Must' or 'have to' with 得 (děi)

The auxiliary verb (děi) conveys necessity or obligation.

The equivalent in English is 'must' or 'have to'.

The pattern is [subject] + + [verb] + [object]

Prohibition can be expressed using 不得 (bùdé) as illustrated in the next topic.

Note that focuses more on intention or plan, while emphasizes obligation or necessity.

Examples:
我得学中文。
wǒ děi xué zhōngwén.
I must learn Chinese.
他得从家里拿东西。
tā děi cóng jiālǐ ná dōngxī.
He must take things from home.
你得赶来这里帮忙。
nǐ děi gǎn lái zhèlǐ bāngmáng.
You must hurry (come) here to help.
你得从公司带东西回来。
nǐ děi cóng gōngsī dài dōngxī huílái.
You must bring things back from the company.

(dài) means 'to bring'

回来 (huílái) means 'to come back'

她得进来拿她的包。
tā děi jìnlái ná tā de bāo.
She must come in to get her bag.
他得出去接朋友。
tā děi chūqù jiē péngyǒu.
He must go out to pick up his friend.

(jiē) means 'pick up'

她得进来找她的手机。
tā děi jìnlái zhǎo tā de shǒujī.
She must come in to find her phone.
我得回去拿作业。
wǒ děi huíqù ná zuòyè.
I must go back to get my homework.
你得从家里出来吃饭。
nǐ děi cóng jiālǐ chūlái chīfàn.
You must come out from home to eat.

出来 (chūlái) means 'to come out'

你得进来坐下。
nǐ děi jìnlái zuòxià.
You must come in and sit (down).

坐下 (zuòxià) means 'to sit down'

他得吃两碗米饭。
tā děi chī liǎng wǎn mǐfàn.
He must eat two bowls of rice.
他们得一起去上学。
tāmen děi yìqǐ qù shàngxué.
They must go to school together.

上学 (shàngxué) means 'to go to school'

不得迟到。
bù dé chídào.
Being late is not permitted.
我今天不用去学校。
wǒ jīntiān bù yòng qù xuéxiào.
I don't have to go to school today.
你得告诉老师。
nǐ děi gàosù lǎoshī.
You have to tell the teacher.