Question

No other boy is as tall as James. (Change to comparative
degree​

Answer 1

Answer:John is as tall as Mike.

Tall is an adjective in the positive degree. Here we are comparing the height of two people with a positive adjective. If John and Mike are of the same height, Mike is not taller than John

John is as tall as Mike. = Mike is not taller than John.

Explanation:

Answer 2

Answer:

No boy is taller than James.

Explanation:

When two things are compared by a comparative degree, the use of 'er' takes place to the adjective word in association with the word 'than'. ‘More’ is used when qualities of a single thing are compared, even if the first adjective is a single syllabic word. Double comparative adjectives or superlative adjectives are not used, and is grammatically incorrect.

There are some adjectives that are used with ‘to’, like, senior, junior, superior, inferior, preferable,  prefer, elder. ‘Than’ is not used with these adjectives.

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