The cheetah is faster than all other land animals. (Make it positive)

Comparative degree কে Positive degree তে রূপান্তর করার নিয়ম - 

• Than all other / than any other যুক্ত comparative degree কে Positive করতে হলে এর Structure:
- No other + Object (singular) + verb (singular) + as/so + Comparative এর Positive form + as + Subject.

Comparative: The cheetah is faster than all other land animals.
Positive: No other land animal is as fast as the cheetah.

অন্যদিকে, 
• Than most other/than few other যুক্ত Comparative Degree কে Positive Degree তে রূপান্তর করার নিয়মঃ
(i) প্রথমে Very few বসে + (ii) few other/most other এর পরের অংশ বসে + (iii) verb এর Plural বসে+ (iv) so বসে + (v) Comparative degree এর Positive form বসে + (vi) as বসে (vii) প্রদত্ত sentence এর subject বসে।
যেমন -
Comparative: The cow is more useful than most other animals.
Positive: Very few animals are as useful as the cow.

Source: Advancer Learner's HSC Communicative English by Chowdhury & Hussain.