Using the preposition "con" 1

Con — with (accompaniment, content, manner) — Con expresses accompaniment (Voy con mis amigos), content/ingredient (un café con leche), description (una chica con ojos azules), and manner/instrument (escribe con lápiz; habla con calma). It is much more versatile than the English "with".

Conmigo, contigo, consigo — special forms — After con, the first and second person singular pronouns change form: con + mí → conmigo; con + ti → contigo; con + sí → consigo (with himself/herself). Never say con mí or con ti — these forms don't exist. Other pronouns are regular: con él, con nosotros.

Con in fixed verbal expressions — Many common Spanish verbs and expressions are built with con: contar con (to count on/rely on), soñar con (to dream of), casarse con (to marry), encontrarse con (to meet/run into), quedarse con (to keep). Learn these as fixed combinations.