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Part 1 of 3
The Present Perfect (have/has + past participle) connects past actions to the present, whereas the Simple Past describes actions completed at a specific time in the past.
Passive voice structures require the auxiliary verb 'be' followed by the past participle: Object + be + past participle (+ by Agent).
Worked example
'The new medical device was approved by the committee yesterday.' Using 'was approved' correctly forms the past passive voice.
1.Passive voice constructions combine the auxiliary verb 'be' with a past participle.
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