PAST SIMPLE PAST PERFECT SIMPLE PAST PERFECT CONTINUOUS

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We _________ (explore) the ancient ruins of Machu Picchu for hours before the guide asked to come back.

had been exploring

Before the storm hit, we _____ (walk) for many hours through the ancient ruins of Pompeii.

had been walking (Past Perfect Continuous)

By the time they reached the peak of the mountain, they ______ (climb) the Andes for many days.

had been climbing (Past Perfect Continuous)

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