被动语态:would have been done
I said we would have cleaned the classroom by 500. 我说我们将在五点之前打扫完教室。
I said the classroom would have been cleaned by 500. 我说教室将在五点以前打扫完。
The headmaster said the article would have been translated by the end of next month. 校长说文章将在下月底翻译好。
The day was drawing near when the dam would have been completed. 大坝完工的日子不远了。
He told me that preparations would have been finished by 600. 他告诉我准备工作将在六点前完成。