This article is associated with the course(s):
Introduction to French Grammar
Lui, leur or y? People and Things After à
French often uses à before both people and things:
Je réponds à Marie.
I reply to Marie.
Je réponds à la question.
I answer the question.
At first sight, the structure looks very similar. But when we replace the noun with a pronoun, French treats them differently:
Je réponds à Marie.
→ Je lui réponds.
I reply to her.
but:
Je réponds à la question.
→ J’y réponds.
I answer it.
So why do we use lui in one sentence and y in the other?
That is what we are going to explore.
1. People and Things Can Behave Differently
You may have seen that certain verbs use lui or leur when the indirect object is a person:
| With the person | With the pronoun |
|---|---|
| Je téléphone à Paul. | Je lui téléphone. |
| Nous répondons à nos clients. | Nous leur répondons. |
But when an à + non-person phrase is replaced, French very often uses y:
| With the thing or idea | With the pronoun |
|---|---|
| Je réponds à cette question. | J’y réponds. |
| Nous réfléchissons à ce problème. | Nous y réfléchissons. |
Here, y replaces the whole phrase beginning with à:
à cette question → y
à ce problème → y
And, like lui and leur, y normally goes before the verb.
So compare:
Je lui réponds.
I reply to him / her.
J’y réponds.
I answer it.
The first refers to a person.
The second refers to a thing or idea.
A useful starting point
When you see à + a noun, ask:
Am I referring to a person, or to a thing?
That will often help you decide which pronoun pattern you need. If lui and leur are new to you, then start with our lesson, How to Use Indirect Object Pronouns in French.
2. Y with Things and Ideas
Let’s start with some examples illustrating what happens when the complement is not a person.
| With the thing or idea | With y | English |
|---|---|---|
| Je réponds à la question. | J’y réponds. | I answer it. |
| Elle pense à son avenir. | Elle y pense. | She thinks about it. |
| Nous réfléchissons au problème. | Nous y réfléchissons. | We think about it. |
| Il s’intéresse à la politique française. | Il s’y intéresse. | He is interested in it. |
In these examples, y replaces the whole à + thing or idea phrase.
Notice that this also works when à has combined with an article:
au problème → y
à la question → y
aux conséquences → y
The complete phrase disappears and y takes its place.
3. Y Does Not Show Gender or Number
There is another useful difference.
With lui and leur, French distinguishes between one person and several people:
à Marie → lui
à Marie et Paul → leur
But y does not change according to the gender or number of the thing being replaced.
Compare:
Je pense à ce problème.
→ J’y pense.
Je pense à cette question.
→ J’y pense.
Je pense à ces problèmes.
→ J’y pense.
Je pense à ces questions.
→ J’y pense.
The same pronoun — y — works in all four sentences.
So you do not need separate masculine, feminine, singular or plural forms.
4. The Three Patterns Side by Side
We can now bring everything together into three distinct patterns.
So there are really two questions to ask:
1. What pattern does the verb use?
and:
2. Am I replacing a person or a thing?
Those two questions will take you much further than a rule based simply on seeing à.
5. Begin Recognizing the Patterns
One of the clearest ways to see the difference is to keep the verb the same and change what follows it.
These comparisons are particularly useful because they show that the noun being replaced matters as well as how different verbs behave.
6. Where Does y Go?
In the examples above, y comes before the conjugated verb:
J’y pense.
Nous y répondons.
Elle s’y intéresse.
Ils y réfléchissent.
This is the same general position we also see with lui and leur:
Je lui parle.
Nous leur répondons.
Compare:
Je réponds à Marie.
→ Je lui réponds.
Je réponds à cette question.
→ J’y réponds.
The pronoun changes, but its position before the verb remains familiar.
There are additional rules when an infinitive, compound tense or command is involved, which we can see in this table:
| Structure | With the noun phrase | With y |
|---|---|---|
| With an infinitive | Je vais penser à cette question. | Je vais y penser. |
| Compound tense | J’ai pensé à cette question. | J’y ai pensé. |
| Positive command | Réponds à cette question ! | Réponds-y ! |
| Negative command | Ne réponds pas à cette question ! | N’y réponds pas ! |
7. Y Can Also Refer to a Place
You may already have seen y used in another way:
Je vais à Paris.
→ J’y vais.
I’m going there.
Nous sommes au restaurant.
→ Nous y sommes.
We are there.
That is another major use of y.
In this lesson, however, we are concentrating on cases where y replaces an à + thing or idea:
penser à quelque chose → y penser
répondre à quelque chose → y répondre
s’intéresser à quelque chose → s’y intéresser
The place use is closely related, but it is worth learning as its own pattern.
8. Putting It into Practice
Which pronoun pattern do you need?
Choose the pronoun or pronoun pattern that gives the natural replacement.
A Practical Way to Think About It
You do not need to label every complement grammatically before speaking.
A more useful habit is to learn the pattern with the verb and notice what is being replaced.
For example:
répondre à quelqu’un → lui / leur répondre
répondre à quelque chose → y répondre
penser à quelqu’un → penser à lui / elle / eux / elles
penser à quelque chose → y penser
s’intéresser à quelqu’un → s’intéresser à lui / elle / eux / elles
s’intéresser à quelque chose → s’y intéresser
Over time, these combinations become familiar as complete patterns rather than rules that have to be reconstructed every time.