In French, object pronouns always take a specific position in a sentence with an infinitive verb.
Position of object pronouns with infinitive verbs in French
Look at these affirmative sentences, negative sentences and inverted questions:
Je peux la rencontrer aujourd'hui.I can meet her today.
Valérie doit le garder ce soir.Valérie must babysit him tonight.
J'aimais l'écouter.I used to like listening to him.
Tu ne veux pas les acheter.You don't want to buy them.
Ils ne savent pas l'épeler.They don't know how to spell it.
Je ne pouvais jamais la rattraper.I could never catch up with her.
Allons-nous lui parler ?Are we going to talk to her ?
Doit-on les attendre ?Do we have to wait for them?
Souhaites-tu l'essayer ?Do you wish to try it on?
In French, when object pronouns are used in sentences with a conjugated verb + an infinitive, they are always placed right before the infinitive.
See also Using le/la/l'/les = it/him/her/them (French Direct Object Pronouns),
Using lui/leur = him or her/them (French Indirect Object Pronouns)
and Me/te/nous/vous = Me/you/us/you (French Direct and Indirect Object Pronouns)
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