Past form of adjectives (Lesson 19) You've learned there are two kinds of adjectives in Japanese, I-adjectives and NA-adjectives. I-adjectives end with the syllable I, such as YASUI "inexpensive." ...

Japanese adjectives conjugate to become adverbs. We can change I adjectives that end with syllable I, ... You've learned that when a NA adjective modifies a noun, it takes NA at its end.