Choose the passive form of "When did he finish the work"?

• Active: When did he finish the work?
• Passive: When was the work finished by him?

• When যুক্ত Active voice -কে Passive voice করার নিয়ম:
- প্রথমে When বসবে + তারপর (tense অনুযায়ী) auxiliary verb,
- তারপর Active voice -এর object,
- তারপর মূল verb -এর past participle,
- তারপর by + Active voice -এর subject + ?

• Structure: When + (tense অনুযায়ী) auxiliary verb + object + V₃ + by + subject + ?

• Note: auxiliary verb দুইটি হলে প্রথমটি subject -এর আগে এবং দ্বিতীয়টি subject -এর পরে বসে।

• More example:
- Active: When did he find you?
- Passive: When were you found by him?

Source: A passage to the English Language by S M Zakir Hussain.