Final answer:
To change the voice of 'Samina gave an impressive presentation,' use the passive voice: 'An impressive presentation was given by Samina.'
Step-by-step explanation:
To change the voice of the sentence 'Samina gave an impressive presentation,' we can use the passive voice. The passive voice reverses the order of the subject and object in the sentence and uses a form of the verb 'to be' plus the past participle of the main verb. So, the sentence in the passive voice would be 'An impressive presentation was given by Samina.'