<COI usage>

[sterile olive]

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<COI usage>

[eager ledge]

the choice of which preposition to use depends on the verb and the specific construction.
some verbs use no preposition, some use "à", some use "de", "en"...

some can also use multiple depending on the function.
play a game => jouer à un jeu
play an instrument => jouer __d'__un instrument
play a role => jouer un rôle

while the choice ultimately depends on the verb, there are some useful patterns you can use. For instance, verbs of communication majoritarily use "à" to introduce the person you're communicating with (parler à, demander à, ...)

[pastel apex]

no i meant pronouns

like for example

Je prends le stylo

becomes

Je le prends

or Elle a telephone a john

becomes

elle lui a telephone

because telephoner can be written as telephoner a quelqu'un

[eager ledge]

@pastel apex
the choice of the object pronoun is based on the preposition used, yes.
if the object is direct (no preposition) you have to use a direct object pronoun, like "le/la" (je vois le chemin => je le vois)
if the object uses "à", you have to use either "lui" for people (je parle à quelqu'un => je lui parle) or "y" for places/concepts (je suis à l'école => j'y suis)
if the object uses "de", you have to use "en" (je joue d'un instrument => j'en joue)

[pastel apex]

yes that's my question

thx