Lui era un buono studente che studiava molto.

Questions & Answers about Lui era un buono studente che studiava molto.

Why is it buono studente and not buon studente?
The adjective buono changes its form depending on the sound of the masculine noun that follows it. Because studente starts with an s and another consonant (an impure s), buono keeps its full form. If the noun started with most other consonants or a vowel, it would shorten to buon (like un buon libro).
Why is the article un instead of uno? Do words starting with st not take uno?
The indefinite article always matches the word directly after it, not the noun at the end of the phrase. Since the word right after the article is buono, which starts with a normal consonant, we use un. If the adjective was not there, it would indeed be uno studente.
Why do we use the imperfect tense verbs era and studiava here?
The imperfect tense is used for descriptions and ongoing or repeated actions in the past. Here, era describes a past state (what kind of student he was), and studiava describes a habitual action (he used to study a lot).
Why is who translated as che and not chi?
When who, that, or which refers back to a specific noun that was just mentioned (like studente), you use che. You only use chi when saying he who or anyone who without pointing back to a specific noun.

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