| 總結: | The present study describes the alternation of the expression (overt vs. null) of Spanish second person pronominal subjects (tú and usted) in data from Mexico City. The selection of these pronouns is due to the fact that they are part of the system of forms of address and it is assumed that being used to address the hearer favors their expression. For this reason, a sociolinguistic analysis of two factors related to the interaction is carried out: turn-taking structure and the use of direct speech. The results show that turn taking favors the presence of second person pronominal subjects only if they are referential, since in this context, their presence allows the speaker to address their interlocutor and to structure the conversation. However, contrary to expectations, it is not evident that the need to reproduce the dialogic structure in direct speech narratives favors its expression. Finally, it is clear that when second person pronominal subjects have a generic interpretation, they do not respond to these restrictions.
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