NihonGo
Unit 27Phase H · Plain form

いけいようしの ふつうけい

い-adjectives, plain — the easiest one yet

ですを とるthe whole rule

All four forms from Unit 24 — just drop です.

たかいです → たかい

ぜんぶ おなじnothing new to learn

Same rule for every tense: present, negative, past, past-negative.

たかかったです → たかかった

えいがは たのしかった！

“The movie was fun!”

Step 1

です を とるだけ

Just drop です

Good news: い-adjectives have no new form. You already built all four in Unit 24 — present, negative, past, past-negative. To make them plain, just take off the です. That's the whole rule, for every tense.

ていねいpolite
ふつうplain
Present / futureaffirmative
Present / futurenegative
Pastaffirmative
Pastnegative
つくり方です を とるだけ✓ Unit 24

Here are more い-adjectives in all four plain forms. 🔊 Tap any form to hear it.

presentneg.pastpast neg.
big
small
tall / expensive
cheap
new
old
delicious
fun
good!
Only いい (good) is irregular: every form except the present uses the よ- stem — よくない / よかった / よくなかった.
Step 2

フォームの れんしゅう

Practice: です → the 4 plain forms

See the ていねい (です) form, say all four plain forms in your head, then tap the card to check.

Card 1 / 9

ていねいおおきいですbigtap to reveal the 4 plain forms
Step 3

クイズ

Quiz: pick the right plain form

Read the sentence and the English, then choose the correct plain form.

Question 1 / 6 · 0 correct

fill the blankこの ごはんは blank。This food is delicious.

That was the easy one! Next: な-adjectives & nouns in the plain form.

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