1. Until indicates the time of change of an activity or situation.
Pattern 1: verb + until + time
They waited until six o'clock.
The boys studied until midnight.
Pattern 2: verb + until + beginning of event
They lived here until their wedding; then they left.
She was busy until her graduation.
They didn't watch the game until halftime.
The public beach of Luquillo is one of the most beautiful in Puerto Rico, but its proximity to rain forests, particularly El Yunque National Forest, is what draws visitors here from around the world. Luquillo Beach is a huge plantation of majestic coconut palm shades and more than a mile of fine, shimmering sand.