Tu vas à la bibliothèque ? Oui, j'y vais.
English: Are you going to the library? Yes, I'm going (there).
In French, 'y' and 'en' are pronouns used to replace certain words or groups of words in a sentence. They help avoid repetition and make sentences smoother.
Use 'y' to refer to a place or something introduced by 'à'. Use 'en' to talk about a quantity or something introduced by 'de'. Both pronouns usually come before the verb.
Tu vas à la bibliothèque ? Oui, j'y vais.
English: Are you going to the library? Yes, I'm going (there).
Il pense à son avenir. Il y pense souvent.
English: He thinks about his future. He thinks about it often.
Tu veux du pain ? Oui, j'en veux.
English: Do you want some bread? Yes, I want some.
Nous avons trois enfants. Nous en avons trois.
English: We have three children. We have three (of them).
Elle revient de Paris. Elle en revient demain.
English: She is coming back from Paris. She is coming back (from there) tomorrow.