过去将来完成时的被动语态。校长说教学楼将在五月份之前建成。
The headmaster said that the teaching building would have been completed before May.
过去完成时的被动语态。我们到电影院的时候，所有的电影票都卖完了。
All the film tickets have been sold out when I got to the cinema.
过去完成时的被动语态。我们到电影院的时候，所有的电影票都卖完了。
All the film tickets have been sold out when I got to the cinema.
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