Look at these sentences:
Certaines d'entre elles avaient un pique-niqueSome of them (all female group) had a packed lunch
Certains d'entre eux ont refusé d'y allerSome of them (mixed or male group) refused to go there
As-tu rencontré ces filles?
-Oui, J'ai rencontré certaines d'entre elles.Did you meet these girls?
-Yes, I met some of them.
Tu vois ces mecs?
-Oui, je connais certains d'entre eux.Do you see these guys?
-Yes, I know some of them.
To talk about a portion of a group ('some of them'), we use the indefinite pronouns "certains/certaines" followed by "d'entre eux/d'entre elles"
Note that these pronouns agree with the gender of the group they refer to (if it is a mixed group, it will be "certains d'entre eux"
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