I'm a bit confused about the status of indirect objects as described in this lesson (and in the video). To my knowledge of English grammar, in "I speak to Paul", "to Paul" is a prepositional phrase and not a preposition (to) + an indirect object (Paul). Also, as far as I know indirect objects cannot occur without the presence of direct objects.
Can I instead just memorize that you use the pronouns "lui" and "leur" only with verbs that are normally followed by "à"?
Maarten's contribution is excellent! Here are two more links to Kwiziq's explanation on object pronouns and on indirect object pronouns.
I hope this is helpful.
Bonne journée !
It goes a bit further than that, as per the attached. And there are verb constructs followed by à that do not take a preceding indirect object pronoun.
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