Passive exercise past perfect
had + been + past participle (3rd form)
Examples: Passive past perfect
The window had
The door had been closed.
Electric cars had been invented.
English passive past perfect
Passive Voice with free online passive past perfect, passive rules and passive voice examples.
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Free tutorial to English active and passive voice. So don't hesitate to learn the difference between active voice and passive voice in writing with the English Grammar index active voice and passive voice.