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You're writing about your travel day in your journal. Select ALL the sentences that correctly use a perfect participle clause (Having + past participle) to show one action was completed before another:
The correct answers are Having checked in online, I went straight to the gate and Having packed my bags the night before, I felt relaxed in the morning.
Use a perfect participle clause (Having + past participle) when one action is completed before the main action. "Having check in" is wrong because "check" must be the past participle "checked." The second option incorrectly mixes a present participle with past perfect tense.