基本形式：（1）would + be + 動詞的過去分詞（2）was / were +going to be + 動詞的過去分詞。eg. I knew the work would be finished by 5:00 PM。

我們通過例句來感受下被動態(tài)：
（1）
I knew John would finish the work by 5:00 PM. (Active) 我知道約翰會在5點前結束工作。（主動）
I knew the work would be finished by 5:00 PM. (Passive) 我知道工作會結束于5點之前。（被動）

（2）
I thought Sally was going to make a beautiful dinner. (Active) 我想薩里會去做一頓豐盛的晚餐。（主動）
I thought a beautiful dinner was going to be made by Sally. (Passive) 我想一頓豐盛的晚餐會出自薩里之手。（被動）

（3）
I believed that Jack was going to write a letter to Tom. (Active) 我相信杰克會給湯姆寫信的。（主動）
I believed that a letter was going to be written to Tom by Jack. (Passive) 我相信有封信會寫自杰克之手并被交給湯姆。（被動）

（4）
I knew that my sister would buy a house. (Active) 我知道我姐姐要買房了。（主動）
I knew that a house would be bought by my sister. (Passive) 我知道有一所房子要被我姐姐買下了。（被動）

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