Polite and plain form

The table summarizes the plain form and polite forms of nouns, verbs, Na adjectives, and I adjectives.

polite form丁寧形 → plain form 普通形
Isyadesu → Isyada
いしゃです → いしゃだ
Isyadeshita → Ishadatta
いしゃでした → いしゃだった
Okimasu → Okiru
おきます → おきる
Okimashita → Okita
おきました → おきた
Shizukadesu → Shizukada
しずかです → しずかだ
Shizukadeshita → Shizukadatta
しずかでした → しずかだった
Furuidesu → furui
ふるいです → ふるい
Furukattadesu → furukatta
ふるかったです → ふるかった


Japanese people have different levels of politeness depending on who you are talking to. We call them “ultra-formal”, “formal” (or “polite form”), “normal” (or “plain form”), “informal”, and “rude”.
This proper use is one of the things that makes Japanese difficult. There are certain rules for utilization as long as you understand the idea.

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