Question

a fire broken out in the early hours of the morning find adverbials and indicate their function

Answer 1

"A fire broke out in the early hours of the morning."
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Adverbial ---> in early hours of the morning
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The adverbial here expresses the time when the fire had broken out.

Answer 2

"A fire broke out in the early hours of the morning."
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Adverbial ---> in early hours of the morning
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The adverbial here expresses the time when the fire had broken out.