The detailed answer explains the conversion of sentences from active to passive voice and from simple past to past perfect tense.
Contextual Grammar:
In sentence a, the active voice 'I was carrying' is changed to passive voice 'was being carried by me.' For sentence b, the simple past tense 'Colonel Hunt gave me three flags' is converted to past perfect tense 'Colonel Hunt had given me three flags.' These changes maintain the accuracy of the tense usage in both sentences.
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