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S V O
Active : (a) Mary helped the boy
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Form of passive : be + past participle
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S V
Passive : (b) The boy was
helped by Mary
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In the passive, the object of verb
becomes the subject of the passive verb : “the boy” in (a) becomes the
subject of the passive verb in (b). (a) and (b) have the same meaning.
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TENSES
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ACTIVE
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PASSIVE
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simple present
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Tom opens the door
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The door is opened by Tom
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present progessive
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Tom is opening the door
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The door is being opened by Tom
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present perfect
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Tom has opened the door
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The door has been opened by Tom
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simple past
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Tom opened the door
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The door was opened by Tom
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