Learn 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 used to say this is something we should not do / may not do.

  • 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 Patterns

There are 3 ways this is commonly used

Pattern 1)

食べちゃ (tabe cha dame) = You cannot eat this.

See examples 1~3

Pattern 2)

食べちゃ (tabe cha ikenai) = same meaning

See examples 4~6

Pattern 3)

食べちゃ (tabe cha ikemasen) = same, but more formal

See examples 7~9

This is the more casual / spoken version of

cha ikenai ja dame ちゃいけない じゃだめ jlpt n5 grammar meaning 文法例文 learn japanese flashcards

Download a free flashcard for this lesson to study offline.

- 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

sonna ni jugyou o saboccha dame yo.
You shouldn't skip class so much.
Example #4

kare o shinyou shicha ikenai.
We cannot trust him.
Example #5

yasai o taberu made dezaato o tabecha ikenai yo.
No eating dessert until you finish eating your vegetables.
Example #6

yaccha ikenai koto o yacchatta.
I did something I shouldn't have...
Example #7

jishin o naku shicha ikemasen!
You mustn't lose confidence!
Example #8

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

Vocabulary items are displayed based on the order they appear in the grammar lesson.

View all JLPT N5 Vocabulary Lessons

JLPT N5 vocabulary list

View all JLPT N5 Grammar Lessons

JLPT N5 grammar list

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