When the subject of a sentence isn't doing something the verb is passive. Find out more about passive verbs in this Bitesize Primary KS2 guides.

Sectum is the passive participle of the Latin verb "seco," which means "severed." Sempra is derived from the Latin word "semper," which means "continuously." ...

In “Vex, Hex, Smash, Smooch,” a book devoted to verbs, Constance Hale notes that confusion springs from the word “voice” to describe the relationship between subject and verb.