Breakdown of Era una buon'amica che conoscevo bene.
essere
to be
una
a / an (feminine)
buono
good
l'amica
the female friend (f)
Questions & Answers about Era una buon'amica che conoscevo bene.
Why is there an apostrophe in buon'amica?
Because amica is a feminine noun that starts with a vowel. Normally, the feminine form of "good" is buona, but to make it easier to pronounce, it drops the final -a and replaces it with an apostrophe before another vowel. Note: If it were a masculine friend, it would be un buon amico (no apostrophe!).
Can I put the adjective after the noun and say un'amica buona?
You can, but it changes the feeling slightly. When buono comes before the noun (as in una buon'amica), it describes the quality of the noun itself—meaning she is a close, loyal, or true friend. If you put it after (un'amica buona), it usually describes her personal character, meaning she is a good, kind-hearted person.
Why use conoscevo for "I knew" instead of a form of sapere?
Why are the verbs (era, conoscevo) in the imperfect tense rather than the passato prossimo?
The imperfect tense (l'imperfetto) is used to describe ongoing states, habits, or background situations in the past. Because you are describing a continuing relationship and a state of being ("she was a friend" and "I knew her well") rather than a single completed event, the imperfect is the correct choice here.