Learn Italian: Lo stadio nuovo è aperto oggi. - The new stadium is open today.

Because stadio is a masculine noun that starts with an 's' followed by a consonant ('t'). In Italian, masculine words starting with 's' + consonant (like 'st', 'sp', 'sc'), as well as 'z', use the article lo instead of il. This makes pronunciation much smoother.

Why does the adjective nuovo come after the noun stadio?

In Italian, most adjectives go right after the noun they describe. While English says 'the new stadium', Italian naturally structures it as 'the stadium new' (lo stadio nuovo).

Why does the word è have an accent mark?

The accent mark tells you that è means 'is' (from the verb 'to be'). If you leave the accent off, the word e means 'and'. The accent is very important in writing so you don't mix up these two common words.

Why does aperto end in an 'o' here?

Adjectives in Italian must match the gender and number of the noun they describe. Since stadio is a masculine, singular noun, the adjective aperto (open) takes the masculine singular ending -o. If we were describing a feminine noun, like a door (la porta), it would change to aperta.