「Adjectives and Adverbs」
In Japanese, when using adjectives as predicates, there exists two tenses: present, or past. Here is a list of the tenses and their negative form in both plain, and polite speech styles.
Takai desu Takakunai desu/Takaku arimasen
Kirei da Kirei de wa/ja nai
Kirei desu Kirei de wa/ja arimasen
Takakatta desu Takakunakatta/takaku arimasen deshita
Kirei datta Kirei de wa/ja nakatta
Kirei deshita Kirei de wa/ja arimasen deshita
NOTE: ja is more colloquial than de wa.
These examples represent the three basic constructions in which adjectival predicates are used in the present, past and negative forms.
Hope this is helpful, and see you again soon!
°˖ ✧◝(○ ヮ ○)◜✧˖ ° こゆうきあいはら °˖ ✧◝(○ ヮ ○)◜✧˖ °