Dialects of a language may vary in terms of accents, the words people use, the way people structure their speech. This can be because of geographical distance or because of social factors. Often people who speak the same dialect will live in the same place. Sometimes linguists speak of 'lects'.
1)Yo lleve este reloj la semana pasada.
2)¿Cuando encontraste esa corbata?
3)Ayer nosotros oimos esa musica en la fiesta.
4) Juanjo le vendio aquellos libros a Raquel.