Your journey to Japanese fluency (JLPT N5-N1).

Decoded Slug: ~んだもん (〜nda mon)

Japanese JLPT Grammar Point
~んだもん (〜nda mon)

~んだもん (〜nda mon)

Short explanation:

Used to convey a sense of justification; 'because', 'that's why', 'it's just that'.


Verb-casual + んだもん, い-Adjective + んだもん, な-Adjective + なんだもん, Noun + なんだもん


Okureta nda mon, gomen.
I was late, that's why I'm sorry.
Oishii nda mon, mou chotto tabetai.
It's delicious, that's why I want to eat more.
Tsukarete iru nda mon, hayaku netai.
I'm tired, that's why I want to go to bed early.
Kare wa tomodachi nan da mon, tetsudawanai wake ni wa ikanai.
He's my friend, that's why I can't not help him.

Long explanation:

The ~んだもん grammar point is used when someone wants to give a reason, justification or explanatory information in a more casual and emphatic way. It can be translated as 'because', 'that's why', or 'it's just that' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.

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