By the time you come back, they will have finished the project By the time you come
By the time you come back, they will have finished the project.
=> By the time you come back, the project _______________________.
Đáp án: By the time you come back, the project will have been finished.
Giải thích: Câu bị động thì tương lai hoàn thành: will have been Vp2
Dịch: Trước khi bạn trở lại, dự án sẽ đã được hoàn thành.