No other metal is as useful as iron use most useful
Answers
Using the phrase 'most useful' the Sentance can be reformed as - iron is the most useful metal.
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Answer
Iron is the most useful metal.
Explanation
Given metal is in positive degree. We were asked to change it to superlative degree (most useful) is superlative.
Positive degree
→ When the give statement is assertion with the base form of adjective/adverb, the degree of adjective or adverb is positive.
Example :- Rohan is a good boy.
Comparative degree
→ The degree is higher than the positive degree and a comparison is made with a single or a group of objects.
Example :- Rohan is better than Mohan or Rohan is better than anyone else in his class (the first comparison is with a singular noun and the second with a whole group)
Superlative degree
→ The degree is the highest and it is stated that given object is superior than anything else.
Example :- Rohan is the best boy.
The given sentence is in positive degree
Its other two degrees would be :
No other metal is as useful as iron (Positive)
Iron is more useful than any other metal. (comparative)
Iron is the most useful metal. (Superlative)