Question

no other metal is as useful as iron
change into comparative degree​

Answer 1

Usually, 'than' is used in comparative degrees. ... In its comparative form, 'than' will be used to compare between iron and other metals. Hence your answer is :- Iron is more useful than any other metal..

Answer 2

Answer: Given sentence is in positive degree.

To change the degree to comparative.

Features of comparative degree :-

» Comparison is made between an object with other object/objects

» Usually, 'than' is used in comparative degrees.

Now, in the given sentence, iron is compared with other metals. In its comparative form, 'than' will be used to compare between iron and other metals.

Hence your answer is :-

Iron is more useful than any other metal.