Составе 5 предложений по типу "Mother had cleaned the flat before her cousin returned."

1. John had finished his work before the deadline.2. Sarah had already booked the tickets before her friends changed their plans.3. The teacher had graded all the exams before the students came back to class.4. They had walked for hours before they finally found a place to rest.5. Rachel had packed her bags before she left for the airport.