Pronouns are nothing but the substitutes for nouns. There are different types of pronouns . There are also 2 major categories. They are:

EN pronoun:

The “EN” replaces the supplements introduced by the prepositions “de”.

It can be:

A place where we come from:

Ex: vas-tu au cinema? Non, j’en reviens.

[ Are you going to the movie? No, I come back]

A quantity introduced by a partitive article:

Ex: Veux-tu du gateau? Oui, j’en veux une petite part.

[Would you to have some cake? Yes, I want a little piece.]

A quantity introduced by an adverb of quantity:

Ex: Combien as-tu de tickets? J’en ai pas beaucoup.

[How many tickets do you have? I don’t have many]

A verb which constructs itself with “de”:

Ex: Êtes-vous heureux de votre nouvel ordinateur? Oui, j’en suis contente.

[Are you happy with your new computer? Yes, I am happy about it.]

En pronoun can replace an complement object direct prefixed by “un”/”une”:

Ex: Michael a un frère = il en a un. [Michael has a brother = he has one]

Y Pronoun:

The pronoun “Y” replaces a noun or a group of nouns introduced by “à, au, à la, à l’, aux”.

They can be:

A place:

Ex: Marcel va au bureau. Elle y va.

[Marcel goes to the office. She goes there]

A thing:

Ex: Je m’intéresse à la peinture. Je m’y intéresse.

[I am interested in painting. I am interested in them.]

”Y” can also represent as complement of a place introduced by prepositions like “sur, sous, dehors, etc..”

Ex: La bouteille est sous la chaise. Il y est.

[The bottle is under the chair. It’s there]

Le chat est sur le mûr. Il y est.

[The cat is on the wall.]