のだから details
write + since it is the case that — a reason both sides already accept, pressed home
kaku no da kara
since it is the case that — a reason both sides already accept, pressed home
まだ子供なんだから、そんなに怒らなくてもいいじゃない。
mada kodomo na n da kara, sonna ni okoranakute mo ii ja nai.
He's still a child, so there's no need to get that angry with him. casual
せっかく遠くまで来たのだから、もう少しゆっくり見ていこう。
sekkaku tooku made kita no da kara, mou sukoshi yukkuri mite ikou.
We've come all this way, so let's take a bit longer to look around. neutral
- dictionary form
- past
- negative
- negative + past
- na-adjective
- noun
- colloquial
- polite
- polite, spoken
Examples
since it is the case that — leans on a reason the listener cannot dispute to press a conclusion
まだ子供なんだから、そんなに怒らなくてもいいじゃない。
mada kodomo na n da kara, sonna ni okoranakute mo ii ja nai.
He's still a child, so there's no need to get that angry with him. casual
せっかく遠くまで来たのだから、もう少しゆっくり見ていこう。
sekkaku tooku made kita no da kara, mou sukoshi yukkuri mite ikou.
We've come all this way, so let's take a bit longer to look around. neutral
一度引き受けると言ったんですから、最後までやってください。
ichido hikiukeru to itta n desu kara, saigo made yatte kudasai.
You did say you would take it on, so please see it through to the end. neutral
皆様にお集まりいただいたのですから、忌憚のないご意見をお聞かせください。
minasama ni o atsumari itadaita no desu kara, kitan no nai go iken o o kikase kudasai.
Since you have all taken the trouble to gather here, please give us your frank opinions. formal
Formation
{P}のだからattaches to plain form{NA-stem}なのだからattaches to na-adjective{N}なのだからattaches to noun
Variant notes
- んだから — the spoken squeeze, and the one that carries reproach — 言ったんだから、ちゃんとやってよ presses the hearer with something they cannot deny.
Notes
command, a decision. A non-volitional event report does not fit: ?雨が
降っているのだから、中止になった, where 中止にしよう is
fine and ordinary から covers the report.
Related patterns
Similar
plain から states a reason the listener may be hearing for the first time; のだから claims the reason is already established between you and uses it to push a conclusion — 子供なんだから仕方がない appeals to something obvious, where 子供だから merely informs.
ものだから excuses something already done and ends in the lapse it is accounting for; のだから pushes forward at the listener and ends in a judgment, a request or a command — 電車が止まっていたものだから遅れました against 約束したのだから守りなさい.
The same explanatory の — んです closes the sentence and offers the whole of it as the explanation owed (電車が止まっていたんです), while のだから carries that の on into から, so the shared ground stops being the point and becomes the premise of whatever follows.
からこそ singles the reason out as THE one that counts and rules out any other (君だからこそ頼む); のだから makes no such exclusive claim and only insists the reason is already shared, so it presses where からこそ selects.
Lookalikes
One nominal head apart on the noun frame — 彼なのだから treats "being him" as an accepted fact and presses a conclusion from it, while 彼のことだから reads his known character and ventures a guess about what he has done; ことだから's main clause is conjecture, のだから's is a demand or a verdict.