Choose the passive form of the sentence:
Turn off the lights before you go to sleep.

Active Voice: Turn off the lights before you go to sleep.
Passive Voice: Let the lights be turned off before you go to sleep.

• শুধু মূল verb দিয়ে শুরু হওয়া imperative sentence এর active voice থেকে passive করার নিয়ম:
→ প্রথমে Let বসবে;
→ Active voice এর object টির subject রূপে বসবে;
→ be বসবে;
→ মূল verb এর past participle বসবে।

• Structure: Let + object টির subject হয় + be + মূল verb এর past participle + extensions.

More Example:
Active Voice: Complete the task without any delay.
Passive Voice: Let the task be completed without any delay.

Source: Advanced Learner's HSC by Chowdhury & Hossain.