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[48th BCS preli]

The correct answer is: গ) By whom was the work done?

• Who - এর পরিবর্তে প্রথমেই By whom বসবে।
- তারপর Tense অনুযায়ী auxiliary verb বসবে।
- তারপর active voice- এর object টি passive voice - এর subject হবে।
- তারপর মূল verb - এর past participle বসবে।
- Sentence টি interrogative sentence - এ-ই থাকবে, তাই শেষে interrogative চিহ্ন '?' বসবে।

Active voice: Who did the sum?
Passive voice: By whom was the sum done?

Active: Who did the work?
Passive: By whom was the work done?

অন্য অপশনগুলো ভুল:
ক) By whom the work was done?
- Interrogative structure ভুল।
- Question form এ auxiliary verb আগে আসে।

খ) Whom had the work done by?
- ভুল tense এবং structure.

ঘ) Who was the work done?
- অর্থ ও structure—দুটোই ভুল।
-"Who" ব্যবহৃত হয়েছে, কিন্তু passive voice-এ subject “by whom” হওয়া উচিত।
- "by" preposition নেই।

Source: Advanced Learner's HSC Communicative English Grammar & Composition by Chowdhury & Hossain.