Colloquial conjunction used to give a reason or justification, often with a defensive or explanatory tone. Common in casual speech.
だって、私も忙しかったんだから。
After all, I was busy too.
どうして遅刻したの？ーだって電車が遅れたんだもん。
Why were you late? — Because the train was delayed.
Colloquial conjunction used to introduce an objection or counterpoint, similar to 'but' or 'even so'. Often used in informal arguments.
だって、それは無理だよ。
But that's impossible.
彼は優しい。だって、時々厳しすぎる。
He is kind. But sometimes he is too strict.
Particle meaning 'even' or 'also', attached to nouns. Emphasizes that the noun is included in a statement, often with a nuance of surprise or extremity. Can be used with question words to mean 'any-' (e.g., 誰だって = anyone).
子供だってできるよ。
Even a child can do it.
私だって行きたい。
I want to go too.
誰だって間違いはある。
Anyone makes mistakes.
Particle used at the end of a sentence to indicate hearsay or to seek confirmation, similar to 'I heard that...' or 'you mean...'. Often used in casual conversation to repeat or question what someone said.
明日は雨だって。
They say it will rain tomorrow.
彼、来ないんだって？
You mean he's not coming?
But I was busy, you know!
But isn't that wrong?
Even a child can understand that.
I heard he's not coming.
だって is a casual, conversational way to say 'because', whereas なぜならば is formal and used mainly in writing or speeches.
だって introduces a reason with a defensive or complaining tone similar to もの, but だって typically starts the sentence while もの comes at the end.
だって is a casual, often defensive 'because' typically used when answering a question, whereas なにせ is a set phrase for explaining a situation with a calmer, more explanatory tone.