Questions & Answers about Il viaggio è costoso.
Il is the masculine singular definite article in Italian, used before nouns that:
• are masculine
• are singular
• begin with a simple consonant (not s+consonant, z, gn, ps, x, y)
Since viaggio meets all three criteria, we say il viaggio.
• È (with a grave accent) is the third-person singular present of the verb essere (to be): “he/she/it is.”
• E (without an accent) is the conjunction “and.”
The accent distinguishes the verb from the conjunction.
Adjectives must agree in gender and number with the noun. From costoso (masculine, singular) we get:
• Feminine singular: costosa
• Masculine plural: costosi
• Feminine plural: costose
Yes, for example:
• Il viaggio costa molto. (“The trip costs a lot.”)
• Il viaggio è caro. (“The trip is dear/expensive.”)