atatakai

Can someone please give a detailed grammatical explanation to why and how Atatakai has become atatakakute? thanks!

When you join verb sentences or adjective sentences with "and", the first verb or the first adjective is changed to the "te-form". "Atatakakute" is the te-form of "atatakai". For example, if you want to say "This sweater is warm and pretty," you would say: Kono SEETAA wa atatakakute, kiree desu. Drop off "i" from "atatakai" and add "kute". That's how you get the te-form of an I-adjective. On the other hand, if you place a NA-adjective first in this sentence: Kono SEETAA wa kiree de atatakai desu. Na-adjective does not have a te-form. Instead, you add "de".

:) thanks, that was a load off