Question

Pollution is the greatest threat to our existence.change into positive and conparitive ​

Answer 1

Answer:

pollution is a threat to our existence

pollution is more greater threat to our existence

hope it helps :)

Answer 2

Answer:

The given sentence is in superlative degree. 'one of the greatest'. 'The' is always used in superlative degree and the adjective 'greatest' is also in the same degree.

Positive degree: Few honours in the world are as great as the Nobel Prize.

Comparative degree: The Nobel Prize is greater than most other honours in the world.