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Questions & Answers about Ellas son amigas.
Why do we use ellas instead of ellos here?
Ellas specifically means 'they' for a group made up entirely of females. If the group of friends were all males, or a mix of males and females, you would use ellos instead.
Why is the verb son in this sentence?
Why does the word for friends end in -as here?
Could I just say Son amigas without ellas?
Yes! In Spanish, you can often drop the subject pronoun. Because son means 'they are' and amigas tells us they are a group of females, the word ellas is not strictly required. You mostly include it to add emphasis or to be absolutely clear who you are talking about.