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Why do causal subordinate clauses ending in -から take だ as a means to connect
nouns and な adjectives (e.g. 日本人だから), whereas causal subordinate clauses
ending in -ので take な (e.g. 日本人なので)?

I read that だ derives from て+ある, whereas な derives from に+ある, but why would
one causal conjunction require で, whereas another one requires に?

Just trying to make sense of it all…

Thank you!
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2018-07-23T09:01:37.293
60316
2018-07-23T13:13:30.270
30417
question
etymology classical-japanese subordinate-clauses particle-な old-japanese
だ versus な in causal subordinate clauses
This explanation is tautological but I just have to say it's because から
follows a terminal form, which of the copula is だ while の is a kind of noun,
which needs an attributive form to be modified, which of the copula is な.

Their etymology has nothing to do with this issue.
CC BY-SA 4.0
2018-07-23T13:13:30.270
60323
2018-07-23T13:13:30.270
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answer