xlegend_

[tawdry hollow]

Please be patient

Our volunteers look into many questions every day; sometimes it takes them a little while to answer.

Pro tip: you can rename the thread title with `.tr <thread name>`

Make it descriptive, including relevant context, but also to the point. This way you improve your chances of getting a more relevant and specific answer.

[bitter ember]

y is used to denote a place - it's a direct object to be precise

Je vais chez le medecin → J'y vais

lui is used for people (singular)
Je parle à mon ami → Je lui parle

[junior rose]

"chez le médecin" the propositional phrase refers to a location, because it could be replaced by "Vas tu à la bibliothèque"..

Don't get distracted by the fact that it's "le médecin"

[steady dirge]

Chez le médecin answers the question "où vas-tu ?".
The indirect pronoun replaces the indirect object that answers the question "à quoi vas-tu ?" which doesn't make much sense.