Used with the passive periphrastic.
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A literal translation of the passive periphrastic + dative of agent often sounds awkward,
and so it is generally best to transform such clauses into active constructions.
Ex: Hic liber mihi cum cūrā legendus erit.
This book will have to be read by me with care.
(Better) I will have to (ought to, must, should) read this book with care.
Ex: Illa fēmina omnibus laudanda est.
That woman should be praised by all.
(Better) Everyone should praise that woman.
Ex: Pāx ducibus nostrīs petenda erat.
Peace had to be sought by our leaders.
(Better) Our leaders had to seek peace.