Each item contains a short command expressed directly. Change it by translating the direct command into an indirect command, keeping the sequence of tenses indicated by the main verb, and preceding it by ut or ne. Verbs of asking and ordering use different constructions: rogare and iubere + acc., imperare and mandare + dative, quaerere and petere + a/ab and ablative.
mater filiis imperavit: "ad cenam venite." Answer: ut ad cenam venirent: in expressing the command indirectly, the speaker puts the filii in the third person, and since imperavit is a past tense, the subjunctive must be imperfect.
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