"was stolen" is a passive verb phrase relating to a stealing event, which happened while he was at a rest area. "was stolen" is, I would argue, not a passive verb phrase at all but, rather, a linking verb ("was") followed by "stolen" as an adjective.
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Answer:
"was stolen" is a passive verb phrase relating to a stealing event, which happened while he was at a rest area. "was stolen" is, I would argue, not a passive verb phrase at all but, rather, a linking verb ("was") followed by "stolen" as an adjective.