French Phrase
Je dois bosser dur.
Meaning
Literally ‘I have to work hard.’ The sentence conveys a personal obligation to put in a lot of effort, often because of a deadline or a demanding task. It is informal and carries a slightly urgent tone.
When to use
Use this phrase in casual conversation with friends, classmates, or coworkers when you want to explain why you’re busy or stressed. Avoid it in formal emails, official reports, or when speaking to someone you need to show respect to.
✦Grammar Breakdown
Jedoisbosserdur.
Subject pronoun – Je
The first‑person singular pronoun used before a verb.
Modal verb – devoir (dois)
Dois is the present‑tense form of devoir for ‘je’; it expresses obligation or necessity.
Colloquial verb – bosser
Bosser is slang for ‘to work’; it is informal and common in spoken French.
Adverb – dur
Dur follows the verb and means ‘hard’ or ‘intensely’; it modifies the manner of the action.
🗨In Conversation
Je dois bosser dur pour finir ce projet avant vendredi.
I have to work hard to finish this project before Friday.
Je comprends, bon courage !
I understand, good luck!
✕Common Mistakes
Je doit bosser dur.
The verb devoir must agree with the subject ‘je’; the correct form is ‘dois’.
Je dois bosser dur pour le rapport officiel.
‘Bosser’ is informal; in formal contexts replace it with ‘travailler’.
Je dois dur bosser.
‘Dur’ must stay after the verb; placing it before the verb (e.g., ‘dur bosser’) is ungrammatical.
↔Alternatives
Je dois travailler dur.
I have to work hard.
Il faut que je bosse dur.
I need to work hard.
Je suis obligé de travailler dur.
I am forced to work hard.
Cultural Tip
‘Bosser’ is a slang verb that originated from student jargon and is now widely used by younger speakers. It adds a relaxed, almost playful tone, so it’s perfect for informal chats but sounds out of place in a business letter or a formal presentation. In France, the idea of ‘working hard’ (travailler dur) is often balanced with the concept of ‘working smart’ (travailler intelligemment).