Learn Italian: Faccio un grande favore per Marco. - I am doing a big favor for Marco.

Faccio is the "I" form of the verb fare (to do / to make). Fare is highly irregular, so its forms just have to be memorized! You also don't need to say io faccio (I do) because the unique faccio form already tells us exactly who is doing the action.

Why is the translation "I am doing" when faccio usually means "I do"?

The Italian present tense is very flexible. It covers both the simple present ("I do") and the present continuous ("I am doing"). You can use faccio for things you do every day, as well as things you are doing right this second.

Why is the adjective grande placed before the noun favore?

While most Italian adjectives go after the noun they describe, a few very common ones frequently go before it. Grande (big/great), bello (beautiful), and buono (good) are classic examples of this exception.

Favore ends in -e. How can I tell if it is masculine or feminine in this sentence?