y and en — two tiny pronouns that absorb everything

one replaces à, the other replaces deA2

In one line

y stands in for anything introduced by à, and en for anything introduced by de or by a quantity.

The table

PronounReplacesExample
y /i/à /a/ + a thingJe pense à mon travail /ʒə pɑ̃s a mɔ̃ tʁa.vaj/ → J'y pense. /ʒi pɑ̃s/
y /i/a placeJe vais à Paris /ʒə vɛ.z‿a pa.ʁi/ → J'y vais. /ʒi vɛ/
en /ɑ̃/de /də/ + a thingJe parle de ce film /ʒə paʁl də sə film/ → J'en parle. /ʒɑ̃ paʁl/
en /ɑ̃/a quantityJ'ai deux frères /ʒe dø fʁɛʁ/ → J'en ai deux. /ʒɑ̃.n‿e dø/
en /ɑ̃/du /dy//de la /də la//des /de/Je bois du café /ʒə bwa dy ka.fe/ → J'en bois. /ʒɑ̃ bwa/
en /ɑ̃/originJe viens de Lyon /ʒə vjɛ̃ də ljɔ̃/ → J'en viens. /ʒɑ̃ vjɛ̃/

Both, like every other pronoun, come before the verb.

English has nothing that corresponds to these, which is why they get left out. English either repeats the noun ("I'm thinking about work") or drops the phrase entirely ("I have three", "I've got some"). French does neither: it puts y or en in and keeps them there. J'en ai trois — literally "I of-them have three" — is not optional; J'ai trois is not a sentence.

y — two jobs

1. Standing in for a place

Any preposition of place, not just à:

Je vais à la banque. /ʒə vɛ.z‿a la bɑ̃k/J'y vais. /ʒi vɛ/
Il habite en France. /il a.bi.t‿ɑ̃ fʁɑ̃s/Il y habite. /il i a.bit/
Le livre est sur la table. /lə li.vʁ‿ɛ syʁ la tabl/Le livre y est. /lə livʁ i ɛ/
Je travaille dans ce bureau. /ʒə tʁa.vaj dɑ̃ sə by.ʁo/J'y travaille. /ʒi tʁa.vaj/

2. Standing in for à + a thing (not a person)

Je pense à mes examens. /ʒə pɑ̃s a me.z‿ɛɡ.za.mɛ̃/J'y pense. /ʒi pɑ̃s/
Je réponds à la question. /ʒə ʁe.pɔ̃ a la kɛs.tjɔ̃/J'y réponds. /ʒi ʁe.pɔ̃/
Il s'intéresse à la musique. /il sɛ̃.te.ʁɛs a la my.zik/Il s'y intéresse. /il si ɛ̃.te.ʁɛs/

The y / lui boundary: if what follows à is a person → lui/leur. If it is a thing → y.

Je pense à Marie → Je pense à elle · Je pense à mon travail → J'y pense

en — three jobs

1. Standing in for de + a thing

Je parle de ce problème. /ʒə paʁl də sə pʁɔ.blɛm/J'en parle. /ʒɑ̃ paʁl/
J'ai besoin d'aide. /ʒe bə.zwɛ̃ dɛd/J'en ai besoin. /ʒɑ̃.n‿e bə.zwɛ̃/
Il est content de son travail. /il ɛ kɔ̃.tɑ̃ də sɔ̃ tʁa.vaj/Il en est content. /il ɑ̃.n‿ɛ kɔ̃.tɑ̃/

2. Standing in for an uncountable or indefinite noun

Je bois du café. /ʒə bwa dy ka.fe/J'en bois. /ʒɑ̃ bwa/
Elle mange de la salade. /ɛl mɑ̃ʒ də la sa.lad/Elle en mange. /ɛl ɑ̃ mɑ̃ʒ/
J'achète des pommes. /ʒa.ʃɛt de pɔm/J'en achète. /ʒɑ̃.n‿a.ʃɛt/

3. With a quantity — and the quantity stays

This is the important point: when a number or a quantity is in the sentence, en appears and the number is repeated:

J'ai trois frères. /ʒe tʁwa fʁɛʁ/J'en ai trois. /ʒɑ̃.n‿e tʁwa/
Je veux un café. /ʒə vø.z‿œ̃ ka.fe/J'en veux un. /ʒɑ̃ vø.z‿œ̃/
Il a beaucoup d'amis. /il a bo.ku da.mi/Il en a beaucoup. /i.l‿ɑ̃.n‿a bo.ku/
Elle achète un kilo de riz. /ɛl a.ʃɛ.t‿œ̃ ki.lo də ʁi/Elle en achète un kilo. /ɛl ɑ̃.n‿a.ʃɛ.t‿œ̃ ki.lo/

English does the exact mirror image and that is why this feels wrong. English keeps the number and deletes everything else — "How many brothers? — I have three." French keeps both: J'en ai trois. J'en ai alone means "I have some"; only J'en ai trois means "I have three". Think of en as the "of them" that English also has and simply chooses not to say.

In the negative

PositiveNegative
J'en ai un. /ʒɑ̃.n‿e œ̃/Je n'en ai pas. /ʒə nɑ̃.n‿e pa/ — the number drops
J'y vais. /ʒi vɛ/Je n'y vais pas. /ʒə ni vɛ pa/

In the past and with two verbs

Pronunciation
pastJ'y suis allé.
J'en ai pris.
/ʒi sɥi.z‿a.le/ · /ʒɑ̃.n‿e pʁi/
two verbsJe vais y aller.
Je veux en acheter.
/ʒə vɛ.z‿i a.le/ · /ʒə vø.z‿ɑ̃.n‿aʃ.te/
positive imperativeVas-y !
Prends-en !
/va.zi/ · /pʁɑ̃.z‿ɑ̃/
negative imperativeN'y va pas !
N'en prends pas !
/ni va pa/ · /nɑ̃ pʁɑ̃ pa/

That s in Vas-y: the imperative of aller is normally Va, but before y and en it takes an s so a liaison can be made — Vas-y /va.zi/. The same applies to -er verbs: Manges-en !

Examples

EnglishFrenchPronunciation
I'm going there.J'y vais./ʒi vɛ/
I'm thinking about it.J'y pense./ʒi pɑ̃s/
I'm talking about it.J'en parle./ʒɑ̃ paʁl/
I have two.J'en ai deux./ʒɑ̃.n‿e dø/
I haven't got any.Je n'en ai pas./ʒə nɑ̃.n‿e pa/
I need it.J'en ai besoin./ʒɑ̃.n‿e bə.zwɛ̃/
Go on then!Vas-y !/va.zi/
Have some!Prends-en !/pʁɑ̃.z‿ɑ̃/
He has a lot.Il en a beaucoup./i.l‿ɑ̃.n‿a bo.ku/
I went there.J'y suis allé./ʒi sɥi.z‿a.le/

Common mistakes

❌✅Why
J'en ai. meaning "I have three"J'en ai trois.The quantity is repeated with en
Je y vais.J'y vais.je elides before y
J'y pense about a personJe pense à lui.y is not used for people
Va-y !Vas-y !That s is there for the liaison
Je en veux.J'en veux.Elision is compulsory

Why two such small words do so much work

both of them were adverbs of place

y comes from Latin ibi, "there", and en from inde, "from there". So they began as a symmetrical pair: one destination, one origin.

Then they expanded to cover anything introduced by the matching preposition — because à marks both a physical destination and a figurative one (penser à), and de marks both a physical origin and a topic (parler de).

Italian has exactly the same two: ci and ne. Spanish lost them, and now has to repeat the full prepositional phrase instead.

English lost them too, and the fossils are still around. Thereof, therein, thereto, thence, hereof — these are precisely the y/en idea, and they survive only in contracts and old texts. "Half thereof" is la moitié … en. English replaced them with "of it" and "there", then started dropping those as well.

The practical point: if you are stuck between y and en, look at the preposition the verb takes, not at the meaning. penser à → y · parler de → en. That is all it is.

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