If phrasal verbs and prepositional verbs become part of a passive sentence, they must not lose their participle:
Various tests should be carried out in order to verify the originality.
The Active
The university students carried out their project focused on assessing language proficiency of young learners in the years 2011 – 2012.
The Passive
The project focused on assessing language proficiency of young learners was carried out in the years 2011 – 2012.
The preposition in the prepositional phrase follows the verb in the passive voice.
Because academic writing focuses on the relations among inanimate entities, there is a strong preference for using prepositional verbs in the passive voice, often with a preceding modal verb. For example: The method outlined could now be applied to a selected number of…