English has two voices for verbs: the active and the passive. The basic form is the active verb, and follows the SVO pattern word order. The passive voice is derived from the active by using the auxiliary verb "to be" and the past participle form of the main verb.
Examples of the passive:
Passive voice Active voice
I am seen I see
You will be struck You will strike
It was stolen It stole
We were carried We carried
They have been chosen They have chosen
Furthermore, the agent and patient switch grammatical roles between active and passive voices so that in passive the patient is the subject, and the agent is noted in an optional prepositional phrase using by, for example:
This pattern continues through all the composite tenses as well. The semantic effect of the change from active to passive is the depersonalization of an action. It is also occasionally used to topicalize the direct object of a sentence, or when the agent is either unknown or unimportant even when included, thus:
EXERCISE ON PASSIVE
Make these sentences passive
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