〜んだもん / 〜んだもの: You use this to give a reason. It is a casual way to say "because" or "but". Sometimes it sounds like a child's excuse.

Dictionary

〜んだもん / 〜んだもの

You use this to give a reason. It is a casual way to say "because" or "but". Sometimes it sounds like a child's excuse.

N3 KMT5CasualAuxiliary ConstructionSpoken OnlyYouthFeminineCasual Explanation And AssertionGrammar

Clause + んだもんPrimary

Clause + んだもの

You use this to give a reason. It is a casual way to say "because" or "but". Sometimes it sounds like a child's excuse.

「どうして泣いているの？」「だっておもちゃが壊れちゃったんだもん。」

"Why are you crying?" "Because my toy broke!"

CasualPastAffirmativeSentence EndingEmphaticEmotions & Psychology Daily Life

「もう帰るの？」「うん、このパーティー全然楽しくないんだもん。」

"Are you going home already?" "Yeah, because this party isn't fun at all."

CasualNon PastNegativeSentence EndingEmphaticDaily Life Emotions & Psychology

「また同じ服着てる。」「だってこれ、お気に入りなんだもん。」

"You're wearing the same outfit again." "But it's my favorite!"

CasualNon PastAffirmativeSentence EndingEmphaticFashion & Beauty Emotions & Psychology

「なんで手伝ってくれないの？」「だって、やり方を知らないんだもの。」

"Why won't you help me?" "Because I don't know how to do it."

CasualNon PastNegativeSentence EndingEmphaticDaily Life

「遅れてごめん！電車が遅れたんだもん、仕方なかったんだ。」

Sorry I'm late! The train was delayed, I couldn't help it.

CasualPastAffirmativeSentence EndingEmphaticTravel & Transportation Daily Life

This phrase shows why you did something. It's like saying 'because!' when you want people to understand you. Sometimes it sounds a little like a child making an excuse.

This is different from 〜んだから. 〜んだから gives a reason for an action. For example, 'We have no time, so hurry.' 〜んだもん just states a reason. It is more personal than 〜んだよ. It is like saying 'because!'

Use this when you want to give a reason. It shows your feelings about something. It means 'because' or 'that's just how it is'. You use it to end a discussion.

Contrasts with(1)

〜んだってば / 〜ってば

Expresses strong, often impatient, insistence or assertion, used when the speaker feels they are not being heard or believed. It is equivalent to saying 'I told you...!' or 'I'm telling you...!' in an exasperated tone.

Less formal alternatives(1)

〜んだ / 〜んです

This is a short way to say 〜のだ or 〜のです. You use it to explain something. It also gives a reason for what you say.

辞書形

This is the basic form of a verb. It is what you find in a dictionary. You use it to make other verb forms.

〜い / 〜かった

This is the basic form of an い-adjective. It describes a quality of something. You use it for present or past qualities.

〜だ / 〜だった

This means 'is' or 'was'. It is the casual way to say 〜です and 〜でした.

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Dictionary

〜んだもん / 〜んだもの

You use this to give a reason. It is a casual way to say "because" or "but". Sometimes it sounds like a child's excuse.

N3 KMT5CasualAuxiliary ConstructionSpoken OnlyYouthFeminineCasual Explanation And AssertionGrammar

Clause + んだもんPrimary

Clause + んだもの

You use this to give a reason. It is a casual way to say "because" or "but". Sometimes it sounds like a child's excuse.

「どうして泣いているの？」「だっておもちゃが壊れちゃったんだもん。」

"Why are you crying?" "Because my toy broke!"

CasualPastAffirmativeSentence EndingEmphaticEmotions & Psychology Daily Life

「もう帰るの？」「うん、このパーティー全然楽しくないんだもん。」

"Are you going home already?" "Yeah, because this party isn't fun at all."

CasualNon PastNegativeSentence EndingEmphaticDaily Life Emotions & Psychology

「また同じ服着てる。」「だってこれ、お気に入りなんだもん。」

"You're wearing the same outfit again." "But it's my favorite!"

CasualNon PastAffirmativeSentence EndingEmphaticFashion & Beauty Emotions & Psychology

「なんで手伝ってくれないの？」「だって、やり方を知らないんだもの。」

"Why won't you help me?" "Because I don't know how to do it."

CasualNon PastNegativeSentence EndingEmphaticDaily Life

「遅れてごめん！電車が遅れたんだもん、仕方なかったんだ。」

Sorry I'm late! The train was delayed, I couldn't help it.

CasualPastAffirmativeSentence EndingEmphaticTravel & Transportation Daily Life

This phrase shows why you did something. It's like saying 'because!' when you want people to understand you. Sometimes it sounds a little like a child making an excuse.

Use this when you want to give a reason. It shows your feelings about something. It means 'because' or 'that's just how it is'. You use it to end a discussion.

Contrasts with(1)

〜んだってば / 〜ってば

Less formal alternatives(1)

〜んだ / 〜んです

This is a short way to say 〜のだ or 〜のです. You use it to explain something. It also gives a reason for what you say.

辞書形

This is the basic form of a verb. It is what you find in a dictionary. You use it to make other verb forms.

〜い / 〜かった

This is the basic form of an い-adjective. It describes a quality of something. You use it for present or past qualities.

〜だ / 〜だった

This means 'is' or 'was'. It is the casual way to say 〜です and 〜でした.

Track your mastery

Kumi's KMT system tracks your mastery across kanji, vocabulary, grammar, and reading. Create a free account to use it on 220,000+ concepts.

〜んだもん / 〜んだもの

Patterns2

Meaning

Examples5

Nuance1

Contrasts1

Discourse Function1

Compare with2

Contrasts with(1)

Less formal alternatives(1)

Prerequisites3

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〜んだもん / 〜んだもの

Patterns2

Meaning

Examples5

Nuance1

Contrasts1

Discourse Function1

Compare with2

Contrasts with(1)

Less formal alternatives(1)

Prerequisites3

Track your mastery