JLPT N5 Grammar (cha ikenai / ja ikenai)


must not do (spoken Japanese)

How to use

Verb ちゃだめ
Verb じゃダメ

Learn Japanese grammar: (cha ikenai) / (cha dame) / (ja ikenai) / (ja dame). Meaning: must not; may not; cannot (spoken Japanese).

This grammar is a more casual way to say we should not do / may not do something. To be more formal, you can use .

Which to use: ちゃ VS じゃ

  • Use the verb’s て form, but then remove the て
    • たべる -> たべて -> たべ
    • “taberu” -> “tabete” -> “tabe cha”

  • If the て form is で, then ちゃ turns to じゃ
    • のむ -> のんで -> のん
    • “nomu” -> “nonde” -> “nonja”

3 Main Ending Patterns

  • (dame) = standard, casual
  • (ikenai) = standard, casual
  • (ikemasen) = same, but more formal

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- Example Sentences

Each example sentence includes a Japanese hint, the romaji reading, and the English translation.

Click the below red button to toggle off and and on all of the hints, and you can click on the buttons individually to show only the ones you want to see.

Example #1

neru mae ni sumaho o micha dame yo.
You shouldn't look at your smartphone before going to bed.
Example #2

koko wa kiken nano de, haiccha dame da yo.
This area is dangerous, so you're not allowed to enter.
Example #3

yaccha ikenai koto o yacchatta.
I did something I shouldn't have...
Example #4

jishin o naku shicha ikemasen!
You mustn't lose confidence!
Example #5

sonna ni jugyou o saboccha dame yo.
You shouldn't skip class so much.
Example #6

kare o shinyou shicha ikenai.
We cannot trust him.
Example #7

aka shingou o mushi shicha ikemasen.
You must not ignore red lights!
Example #8

yasai o taberu made dezaato o tabecha ikenai yo.
No eating dessert until you finish eating your vegetables.
Example #9

kodomo no mae ni warui kotoba o iccha ikemasen.
We must not say bad words in front of children.
Example #10

hatachi miman no hito wa osake o nonja ikemasen.
People under the age of 20 cannot drink alcohol.

Vocabulary List

寝るねるto sleep
スマフォsmart phone
見るみるto look
入るはいるto enter
授業じゅぎょうclass; lecture
さぼるto skip
食べるたべるto eat
やるto do
無くするなくするto lose
赤信号あかしんごうred light
無視むしto ignore
子供こどもchildren; child
言葉ことばword; words
言ういうto say
20歳はたち20 years old (adult in Japan)
未満みまんnot yet
飲むのむto drink

View all JLPT N5 Vocabulary Lessons

JLPT N5 vocabulary list

View all JLPT N5 Grammar Lessons

JLPT N5 grammar list

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