It says here that we don’t use en for de + people, but we use stress pronouns. I know when to use EN, but sometimes I struggle to decide whether to use stress pronouns or COI, because they are both for people, and COI is for indirect objects, so basically it can be used for verbs with DE as well? I know few examples where we always use COI, like parle de, penser.. but, other than that I am never sure.Thanks