If you want to say "some of my friends are girls" then: Algunos de mis amigos son chicas.
We always use feminine pronouns (pronombres femeninos) for feminine nouns (sustanitvos femeninos).
You have to say "algunas de mis amigas"
It depends on what you want to say...
If its to indicate something they do then say: "de todos mis amigos, algunas de las chicas [add verb here]. Meaning: From all my friends, some of the girls [verb].
If you need more help, don't be afraid to ask me! ^^ Spanish is my native language
~Hope this helps~ ^-^
1. Where are the friends?
2. What does Margarita like?
3. What is Pablo wearing?
4. Why does Susana not like the painting?
5. According to Julio, what are the colors?
6. What did the friends do after they left the museum?
7. What color are the chairs that the friends are sitting on?
Use the present tense to answer these. Do you need help with verbs?