somewhere・not anywhere, someone・not anyone
Structure
どこ か + に / へ + Verb[る] → (toward) somewhere
どこ に / へ + も + Verb[ない] → not (toward) anywhereどこ かに ある・どこ にも ない
to exist somewhere ・to not exist anywhere
だれ か + に / へ + Verb[る]→ (toward) someone
だれ に / へ + も + Verb[ない]→ not (toward) anyoneだれ かに 言う・だれ にも 言わない
to say to someone ・to not say to anyone
だれ か + と → with someone
だれ と + も → not with anyone
[When expressions like 誰か/誰も/どこか/どこも(indefinite pronouns) are used with certain particles like に・へ・と, then in the case of 誰か/どこか the particles are attached directly after, and in the case of 誰も/どこも the particles are “sandwiched” between だれ/どこ and も.]