Put the verbs in the past perfect

Put the verbs in the past perfect. (вставьте глаголы в простое совершенное время) 1. She … (go) home by 4pm yesterday.2. The pupils … (translate) only one text by the end of the lesson when the teacher collected their tests.3. The boy … (change) his T- shirt by that time.4. When they came, the party … already … (begin).