Look at these sentences with the pronoun en:
-> Note that en can replace plural things too.
Notice that en as a pronoun can replace phrases introduced by the preposition de + [thing]/[object]/[location] (but not people), particularly with verbs that require de.
In such cases, you cannot replace the noun alone with a pronoun, you must replace the whole de + [noun] group with en.
ATTENTION:
In the case of de + [people], the preposition de remains and is followed by a stress pronoun (moi, toi, lui, elle, nous, vous, eux, elles) replacing and agreeing with the noun:
See also Y can replace à + thing / object / location (adverbial pronoun) and Y = There (adverbial pronoun)
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Examples and resources

J'ai besoin de ma mère tous les jours. - J'ai besoin d'elle aussi.I need my mother every day. - I need her too.
Tu te moques de Paul et Daniel. - Non, je ne me moque pas d'eux !You're mocking Paul and Daniel. - No, I'm not mocking them!
Que penses-tu de cette exposition ? - J'en pense le plus grand bien !What do you think of this exhibition? - I think very highly of it.
