By the time she arrived at the party, everyone had already left.He had never seen such a breathtaking view before he visited the Grand Canyon.The students had finished their exams before they realized they had forgotten their calculators.She had studied French for three years before she decided to move to Paris.The company had spent millions on marketing before realizing their product was not in demand.
Past Perfect Continuous:
They had been waiting for over an hour when the bus finally arrived.By the time he found his keys, he had been searching for them for hours.We had been planning our vacation for months before we finally booked our flights.The construction workers had been working non-stop for weeks before completing the project.She had been studying English for years before she felt confident enough to have a conversation with a native speaker.
Past Perfect:
By the time she arrived at the party, everyone had already left.He had never seen such a breathtaking view before he visited the Grand Canyon.The students had finished their exams before they realized they had forgotten their calculators.She had studied French for three years before she decided to move to Paris.The company had spent millions on marketing before realizing their product was not in demand.Past Perfect Continuous:
They had been waiting for over an hour when the bus finally arrived.By the time he found his keys, he had been searching for them for hours.We had been planning our vacation for months before we finally booked our flights.The construction workers had been working non-stop for weeks before completing the project.She had been studying English for years before she felt confident enough to have a conversation with a native speaker.