I treni sono pronti.

Breakdown of I treni sono pronti.

essere
to be
pronto
ready
il treno
the train

Questions & Answers about I treni sono pronti.

Why does the word for trains end in -i?
Treni is the plural of treno (train). In Italian, masculine nouns that end in -o in the singular change that ending to -i to become plural.
Why do we use i for "the" in this sentence?
i is the plural masculine word for "the". You use it for masculine plural nouns that start with most consonants, like the "t" in treni. The singular phrase il treno (the train) becomes i treni (the trains).
Why does the adjective pronto change to pronti here?
Adjectives in Italian have to match the noun they describe. Because i treni is a masculine plural noun, the adjective pronto (ready) changes its ending to -i to match, becoming pronti.
Doesn't sono mean "I am"? Why is it used for the trains?
It means both! The verb essere (to be) is irregular. Sono can mean "I am" (io sono) or "they are" (loro sono). Since "the trains" acts as a "they", we use the "they are" form of the verb here.

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