Degrees of Comparison of Adjectives
Example:
hot- hotter- the hottest
Interesting- more interesting- the most interesting

Helpful, simple, happy, terrible, narrow, severe, difficult, untidy, modern, warm, low, big, tender, expensive, wise.

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Выручил

helpful - more  helpful  - the most  helpfulsimple - simpler - the simplest happy - happier - the happiestterrible - more  terrible - the most  terriblenarrow - narrower - the narrowestsevere - severer - the severestdifficult - more  difficult - the most  difficultuntidy  - untidier - the untidiestmodern -  more modern - the  most modernwarm - warmer - the warmestLow - lower - the  lowestbig - bigger - the  biggesttender — more tender — the most tenderexpensive - more expensive - the most expensivewise — wiser — the wisest