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Questions & Answers about I treni sono pronti.
Why does the word for trains end in -i?
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.