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Grammar Book

GrammarBook N5: ใ„-adjectives

  • 09 Jan, 2026
  • Com 0
N5-G-020

ใ„-Adjectives (Present & Negative)

Supporting / Adjectives

๐Ÿ‘€ Layer A: Visual Guide (็›ดๆ„Ÿ็†่งฃ)

๐Ÿ“ Quick Summary (ใพใจใ‚)

ใ€Œใ„ใ€ใง็ต‚ใ‚ใ‚‹ๅฝขๅฎน่ฉž(ใ‘ใ„ใ‚ˆใ†ใ—)ใงใ™ใ€‚็‰ฉ(ใ‚‚ใฎ)ใฎ็Šถๆ…‹(ใ˜ใ‚‡ใ†ใŸใ„)ใ‚„ๆ€ง่ณช(ใ›ใ„ใ—ใค)ใ‚’่ชฌๆ˜Žใ—ใพใ™ใ€‚
ๅฆๅฎšๅฝข(ใฒใฆใ„ใ‘ใ„)ใ‚’ไฝœใ‚‹ใจใใฏใ€ๆœ€ๅพŒใฎใ€Œใ„ใ€ใ‚’ๅ–ใฃใฆใ€ใ€Œใใชใ„ใ€ใ‚’ใคใ‘ใพใ™ใ€‚
i-Adjectives always end in the Hiragana “i”. To make them negative, you must DROP the “i” and add “kunai”.

Positive: ใŠใ„ใ—ใ„ ใงใ™ (Oishii desu)
Negative: ใŠใ„ใ—ใใชใ„ ใงใ™ (Oishi-kunai desu)

๐Ÿ”— Connected Grammar (้–ข้€ฃๆ–‡ๆณ•):

  • N5-G-001: AใฏBใงใ™ (Basic Sentence)
  • N5-G-021: ใช-Adjectives (Comparison)

๐Ÿ” Layer B: Deepening (ๆทฑๆŽ˜ใ‚Š)

๐Ÿ’ก Raya’s Hack (ๆ”ป็•ฅๆณ•)

ใ€Œใ„ๅฝขๅฎน่ฉžใ€ใฎใ—ใฃใฝใฏใ€ใƒˆใ‚ซใ‚ฒใฎใ—ใฃใฝ๏ผ
ๅฆๅฎš(ใฒใฆใ„)ใซใ™ใ‚‹ๆ™‚ใฏใ€ใƒใ‚ตใƒŸใงใ€Œใ„ใ€ใ‚’ใƒใƒงใ‚ญใƒณใจๅˆ‡ใฃใฆใ€ใ€Œใใชใ„ใ€ใ‚’่ฒผใ‚Šไป˜ใ‘ใ‚ˆใ†๏ผ
ร— ใŠใ„ใ—ใ„ใ˜ใ‚ƒใชใ„
ใ€‡ ใŠใ„ใ—๏ผˆใ‚ซใƒƒใƒˆ๏ผ‰๏ผ‹ ใใชใ„ ๏ผ ใŠใ„ใ—ใใชใ„๏ผ

Think of the final “i” as a lizard’s tail. For negative sentences, cut off the “i” with scissors and paste “kunai” instead! Never say “Oishii janai”.

๐Ÿšง Joy’s Mistake (ใ‚ˆใใ‚ใ‚‹้–“้•ใ„)

Scene: Joy says the sushi is not expensive.

Joy: ใ€Œใ“ใฎๅฏฟๅธใฏ ้ซ˜ใ„ ใงใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚ใ€
(Kono sushi wa takai dewa arimasen.)

โŒ Wrong!

Why?

ใ€Œใงใฏใ‚ใ‚Šใพใ›ใ‚“ใ€ใฏๅ่ฉž(ใ‚ใ„ใ—)ใซไฝฟใ„ใพใ™ใ€‚ใ„ๅฝขๅฎน่ฉžใซใฏไฝฟใˆใพใ›ใ‚“๏ผ
ๆญฃ่งฃใฏใ€Œ้ซ˜ใใชใ„ ใงใ™ใ€ใงใ™ใ€‚

“Dewa arimasen” is for Nouns. You cannot use it for i-adjectives. You must use the “kunai” form. Correct: “Taka-kunai desu”.

๐Ÿ”ฅ Layer C: Practice Loop

Now itโ€™s time to test your learning through the next 10 practice drills!

Level 1: Basic Conjugation

Q1. Takai (Expensive) โ†’ Negative?
็ญ”ใˆ: Taka-kunai (้ซ˜ใใชใ„)

(Drop i, add kunai)

Q2. Oishii (Delicious) โ†’ Negative?
็ญ”ใˆ: Oishi-kunai (ใŠใ„ใ—ใใชใ„)

(Drop final i, add kunai)

Q3. Atsui (Hot) โ†’ Negative?
็ญ”ใˆ: Atsu-kunai (ๆš‘ใใชใ„)

(Not hot)

Q4. Samui (Cold) โ†’ Negative?
็ญ”ใˆ: Samu-kunai (ๅฏ’ใใชใ„)

(Not cold)

Q5. Ii (Good) โ†’ Negative? [EXCEPTION ALERT]
็ญ”ใˆ: Yoku-nai (ใ‚ˆใใชใ„)

(Exception: “Ii” always changes to “Yoi” before conjugating -> Yoku-nai)

Level 2: Advanced (Sentences)

Q6. Translate: “This movie is interesting.” (Omoshiroi)
็ญ”ใˆ: ใ“ใฎๆ˜ ็”ป(ใˆใ„ใŒ)ใฏ ้ข็™ฝ(ใŠใ‚‚ใ—ใ‚)ใ„ ใงใ™ใ€‚

(Kono eiga wa omoshiroi desu.)

Q7. Translate: “This bag is not big.” (Ookii)
็ญ”ใˆ: ใ“ใฎใ‹ใฐใ‚“ใฏ ๅคงใใใชใ„ ใงใ™ใ€‚

(Kono kaban wa ooki-kunai desu.)

Q8. Translate: “Japan is small.” (Chiisai)
็ญ”ใˆ: ๆ—ฅๆœฌใฏ ๅฐ(ใกใ„)ใ•ใ„ ใงใ™ใ€‚

(Nihon wa chiisai desu.)

Q9. Translate: “Japanese is not difficult.” (Muzukashii)
็ญ”ใˆ: ๆ—ฅๆœฌ่ชžใฏ ้›ฃ(ใ‚€ใšใ‹)ใ—ใใชใ„ ใงใ™ใ€‚

(Nihongo wa muzukashi-kunai desu.)

Q10. Translate: “Today is busy.” (Isogashii)
็ญ”ใˆ: ไปŠๆ—ฅ(ใใ‚‡ใ†)ใฏ ๅฟ™(ใ„ใใŒ)ใ—ใ„ ใงใ™ใ€‚

(Kyou wa isogashii desu.)

Related posts:

GrammarBook N5 : AใฏBใงใ™ (A is B) GrammarBook N5: The Particle ใฏ (topic marker) GrammarBook N5: The Particle ใ‚‚ (also) GrammarBook N5: Japanese Verb groups (u/ru/irregular)
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GrammarBook N5: Aใฏ Bใซ ใ‚ใ‚Šใพใ™ / ใ„ใพใ™ (Location Sentence)
GrammarBook N5: ใช-adjectives

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