4. Tú vives con (tus / sus) padres.

Answer

The correct answer is 'tus'. In Spanish, possessive adjectives must agree with the subject of the sentence. The subject here is 'Tú' (the informal second-person singular 'you'). The possessive adjective that corresponds to 'tú' is 'tu' for singular items or 'tus' for plural items. Since 'padres' (parents) is plural, we use 'tus'. The alternative 'sus' is used for formal 'you' (usted/ustedes), 'he', 'she', or 'them'. Therefore, the completed sentence is 'Tú vives con tus padres' (You live with your parents).