The passive form of the sentence "Turn off the lights." is -

Active Voice: Turn off the lights.
Passive Voice: Let the lights be turned off.

→ Turn (base form) → Turning (present participle) → Turned (past form) → Turned (past participle form).

• Verb দ্বারা শুরু হওয়া imperative sentence কে passive voice করার নিয়ম:
→ প্রথমে Let বসে।
→ object + be + verb এর past participle বসে।

More Example:
Active Voice: Open the window.
Passive Voice: Let the window be opened.