Общий: Will this bridge have been built by 2020?
Специальный: What year will this bridge have been built by?
Альтернативный: Will this bridge have been built by 2020 or by 2021?
Разделительный: This bridge will have been built by 2020, won't it?
Общий: Will this bridge have been built by 2020?
Специальный: What year will this bridge have been built by?
Альтернативный: Will this bridge have been built by 2020 or by 2021?
Разделительный: This bridge will have been built by 2020, won't it?