Translation of "Yesterday's boys" (Sticky grammar points)

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Original: The boys whom I saw yesterday were Karl and Jake
Translation:
Kiriqik in um ihastahu attuí sathu Karu tá Gík.
Interlinear: 
Kiriq~ik in  um=i-has-ta-hu            attuí     sa-t-hu    Karu tá  Gík.
boy-PL   REL 1.AGT=PFV-see-3pl.PAT-PST yesterday be-3pl-PST Karl and Jake