Ecce 31: More on Passive & Active Infinitives Change active infinitives to passive; passive to active. An active infinitive ends with -re; a passive with -rī or -ī (if it's 3rd conjugation). USE MACRONS! INCLUDE ENGLISH!!!! Tools Please enter your name. First name Last name   Quiz created by: Ginny Lindzey This activity was created by a Quia Web subscriber. To learn how to make your own, just like this, click here.