Learn Italian: Gioco a calcio con i miei amici. - I play soccer with my friends.

Unlike prepositions like a or di which must combine with definite articles (like al or del), the preposition con (with) usually stays separate. You might occasionally see them combined as coi, but keeping them separate as con i is perfectly normal and the most common way to write it.

Why does the sentence say gioco a calcio instead of just gioco calcio?

In Italian, when you talk about playing a sport or a game, you always use the verb giocare followed by the preposition a. So "to play soccer" is literally "to play at soccer" (giocare a calcio).

Why is there an i before miei amici?

Italian almost always requires a definite article (like il, la, or i) before a possessive word. So instead of just saying "my friends", Italian literally says "the my friends" (i miei amici). The main exception is when talking about a single family member.

Why is the word for "I" missing before gioco?

The ending of the verb tells you who is doing the action. The -o ending in gioco already means "I play". Because of this, subject pronouns like io are usually left out unless you want to add special emphasis.