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Superlative: Dhaka is one of the busiest cities in Bangladesh.
Positive: Very few cities in Bangladesh are as busy as Dhaka.

• "One of the" যুক্ত superlative sentence কে Positive করার Structure হচ্ছে -
- প্রথমে very few বসে,
- Superlative degree-এর পরের অংশ,
- verb-এর plural form,
- as +superlative degree-এর positive form + as,
- প্রদত্ত sentence-এর Subject বসে।

Other options:
খ) No other cities in Bangladesh are as busy as Dhaka.
- ভুল কারণ, "One of the" যুক্ত superlative sentence কে Positive করার ক্ষেত্রে প্রথমে very few বসে।

গ) Very few cities in Bangladesh is as busy as Dhaka.
- ভুল কারণ, "One of the" যুক্ত superlative sentence কে Positive করার ক্ষেত্রে প্রথমে very few বসে এবং verb-এর plural form বসে।

ঘ) No other cities in Bangladesh is as busy Dhaka.
- ভুল কারণ, "One of the" যুক্ত superlative sentence কে Positive করার ক্ষেত্রে প্রথমে very few বসে।

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