What else should we know about the passive voice?

"be + past participle (過去分詞) " is always needed in a passive voice sentence.

Passive voice sentences can be formed with 8 different verb tenses.

They are

Simple Present (現在簡單)

Simple Past      (過去簡單)

Simple Future    (未來簡單)

Present Progressive (現在進行)

Past Progressive       (過去進行)

Present Perfect  (現在完成)

Past Perfect         (過去完成)

Future Perfect      (未來完成)