The three jobs of de

possession · some of · part of the verbA1

In one line

de does three jobs: "of" (the neighbour's car), "some" (I eat some bread), and sometimes it is just glued to the verb. Where it sits in the sentence tells you which.

The table

#JobWhere it sitsExample
1possession — ofbetween two nounsla voiture de mon voisin /la vwa.tyʁ də mɔ̃ vwa.zɛ̃/
2some ofafter a verb of eating / drinking / doingJe mange du pain.
3part of the verb itselfthe verb is incomplete without itremplir le verre d'eau /ʁɑ̃.pliʁ lə vɛʁ do/

1) Possession — and English puts it backwards

Order
Englishneighbour's + car — owner first
Frenchvoiture + de + voisin — thing first

English has two ways of saying this and only one of them matches French. "The car of my neighbour" has the French order; "my neighbour**'s** car" reverses it. French has no apostrophe-s at all, so every possessive has to be rebuilt the long way round: le livre de Marie, never Marie's livre.

And the article that follows:

What it saysArticlePronunciation
un cours de françaiswhat kindnone/œ̃ kuʁ də fʁɑ̃.sɛ/
la voiture du voisinwhoseyes → de + le/la vwa.tyʁ dy vwa.zɛ̃/

2) Some of

English CAN say "some", so it feels like a match — but English can also leave it out, and French cannot:

EnglishFrenchPronunciation
"I'm eating some bread" ✓Je mange du pain./ʒə mɑ̃ʒ dy pɛ̃/
"I'm eating bread" ✓ also fineJe mange pain. not possible/ʒə mɑ̃ʒ pɛ̃/

That optionality is the trap. In English the partitive is a choice; in French it is compulsory.

Pronunciation
Je mange du pain.I'm eating bread/ʒə mɑ̃ʒ dy pɛ̃/
Je bois de la limonade.I'm drinking lemonade/ʒə bwa də la li.mo.nad/
Je bois de l'eau.I'm drinking water/ʒə bwa də lo/

3) Part of the verb itself

Some verbs are incomplete without de. There is no rule — it is learnt with the verb:

VerbMeaningPronunciation
remplir … deto fill something with something/ʁɑ̃.pliʁ də/
avoir besoin deto need/a.vwaʁ bə.zwɛ̃ də/
parler deto talk about/paʁ.le də/
venir deto come from/və.niʁ də/

Exceptions

In a negative sentencedu /dy//de la /də la//des /de//un /œ̃//une /yn/ all become de /də/: Je ne mange pas de pain. /ʒə nə mɑ̃ʒ pa də pɛ̃/
After a stated quantitythe article drops: un kilo de pommes /œ̃ ki.lo də pɔm/
beaucoup de livres /bo.ku də livʁ/
un verre d'eau /œ̃ vɛʁ do/
After verbs of likingaimer /ɛ.me/
adorer /a.do.ʁe/
détester /de.tɛs.te/ never take the partitive, they take the full article: J'aime le pain. /ʒɛm lə pɛ̃/ not du pain /dy pɛ̃/
The verb's own de /də/ takes no articleremplir le verre d'eau /ʁɑ̃.pliʁ lə vɛʁ do/ not de l'eau /də lo/
venir du Canada /və.niʁ dy ka.na.da/that du /dy/ is not a partitive — it is de /də/ + le Canada /lə ka.na.da/, and it does not collapse under a negative

Examples

EnglishFrenchPronunciation
my neighbour's carla voiture du voisin/la vwa.tyʁ dy vwa.zɛ̃/
a French classun cours de français/œ̃ kuʁ də fʁɑ̃.sɛ/
I'm eating breadJe mange du pain./ʒə mɑ̃ʒ dy pɛ̃/
I'm drinking waterJe bois de l'eau./ʒə bwa də lo/
I'm not eating breadJe ne mange pas de pain./ʒə nə mɑ̃ʒ pa də pɛ̃/
a kilo of applesun kilo de pommes/œ̃ ki.lo də pɔm/
I like breadJ'aime le pain./ʒɛm lə pɛ̃/
I need a bookJ'ai besoin d'un livre./ʒe bə.zwɛ̃ dœ̃ livʁ/

Common mistakes

❌✅Why
J'aime du pain.J'aime le pain.With aimer it is the whole thing, not a portion
Je ne mange pas du pain.Je ne mange pas de pain.The partitive collapses under a negative
beaucoup des livresbeaucoup de livresAfter a quantity the article drops
Je ne viens pas de Canada.Je ne viens pas du Canada.That du is not a partitive, so it stays
remplir le verre de l'eauremplir le verre d'eauThe verb's own de takes no article

And one rule that runs across all three

de + vowel → d' · de + le → du · de + les → des

But de la and de l' do not contract.

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