How the word "alcuni" is translated into English
Alcuni sono già arrivati.
Some have already arrived.
Ho letto molti libri, alcuni bellissimi.
I've read a lot of books, some of them wonderful.
Ho invitato dieci amici, alcuni non vengono.
I invited ten friends, some aren't coming.
"alcuni" is in the lesson "Pronouns" (Level 30), along with 17 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.