The Latin passive periphrastic: what must be done — 14–17
The passive periphrastic turns an action into an obligation. Its gerundive agrees with the thing that must be done, while a dative often names the person who has the responsibility.
An action that is required
The passive periphrastic combines a gerundive with a form of sum to say that something has to be done. In English, you often translate it with “must”, “has to” or “should”, rather than with an ordinary passive verb.
Why Latin needed this form
A normal passive says what happens: “the bridge is built”. That does not tell you whether the building is required, advised or accidental. The periphrastic adds pressure or duty, so Roman writers could state plans, laws and responsibilities precisely.
Carthago delenda est
Start with Carthago: feminine nominative singular, so delenda agrees with it. Delenda comes from deleo and means “to be destroyed”; est means “is”. The natural translation is “Carthage must be destroyed”, not merely “Carthage is being destroyed”.
Who has to act?
The phrase mihi liber legendus est looks as if mihi were an ordinary object, but it is a dative: “the book must be read by me”. This feels odd because English normally puts the person first; Latin makes the responsible person a dative and the required thing the subject.
Rules, duties and decisions
You meet the same idea in signs, regulations and personal plans: “helmets must be worn”, “the form has to be signed”, “I need to leave”. Latin’s form is especially useful when reading speeches and political writing, where duty and responsibility are central.
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