The past participle is the third form of a verb: wash -- washed -- washed (regular) write -- wrote -- written (irregular) foresee -- foresaw -- foreseen (irregular) For the passive voice, you need a subject, a finite form of the verb be , and the past participle of a transitive verb. You can also include the agent (the person or thing that performs the action described by the verb), but normally it's better to omit it. The car was washed by John.
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