What is the origin of the term "extended predicate" and are there alternative terms?


My question is in relation to the pattern that appears at the end of sentences
such as:

[code]

    本当なんです。
    本当なの。
    これから行くんです。
    これから行くの。
    
[/code]

I've seen this called the "extended predicate" around the web. **To be clear,
I'm not asking what it means or how to use it.** I'm curious where this term
"extended predicate" came from. It doesn't feel particularly descriptive to
me. Is it a standard way of referring to this pattern? Are there other names?
And is there a standard name for the pattern in Japanese?




I think this was first used in Eleanor Jorden's [_Beginning Japanese_
(1962)](https://books.google.co.jp/books?id=gb-
dd4PU3awC&pg=PA56#v=onepage&q&f=false). Here's how it's described on page 56
of her text:

> Grammatically speaking, an extended predicate consists of a nominal n̄/no +
> √da predicate, with the nominal preceded by a sentence modifier.

Jorden was a prominent structuralist and student of Bernard Bloch, but I don't
_think_ Bloch ever used the term himself, and I don't think the term caught on
with other structuralists or more generally in linguistics, although you might
see it occasionally.

I think it's called an "extended predicate" because it adds another layer of
predication to the clause:

> 〔〜だ〕＋のだ ＝ 〔〜な〕のだ

That doesn't really describe when it's used or what it means, but you'd be
hard-pressed to come up with a label for のだ that does either of those things.
A full definition simply won't fit in a short label. And that's okay--[Labels
Are Not
Definitions](http://itre.cis.upenn.edu/myl/languagelog/archives/004227.html).

Among both learners and linguists, in both English and Japanese, the most
common term I've seen for this is simply のだ. That's also what you'll find it
under in most dictionaries, and I think it's the closest you'll get to a
standard name.

Sometimes this is written in katakana as ノダ in linguistics (to make the [Use-
Mention Distinction](http://plato.stanford.edu/entries/quotation/#2.2)), as in
the phrase ノダ文.




I think this was first used in Eleanor Jorden's [_Beginning Japanese_
(1962)](https://books.google.co.jp/books?id=gb-
dd4PU3awC&pg=PA56#v=onepage&q&f=false). Here's how it's described on page 56
of her text:

> Grammatically speaking, an extended predicate consists of a nominal n̄/no +
> √da predicate, with the nominal preceded by a sentence modifier.

Jorden was a prominent structuralist and student of Bernard Bloch, but I don't
_think_ Bloch ever used the term himself, and I don't think the term caught on
with other structuralists or more generally in linguistics, although you might
see it occasionally.

I think it's called an "extended predicate" because it adds another layer of
predication to the clause:

> 〔〜だ〕＋のだ ＝ 〔〜な〕のだ

That doesn't really describe when it's used or what it means, but you'd be
hard-pressed to come up with a label for のだ that does either of those things.
A full definition simply won't fit in a short label. And that's okay--[Labels
Are Not
Definitions](http://itre.cis.upenn.edu/myl/languagelog/archives/004227.html).

Among both learners and linguists, in both English and Japanese, the most
common term I've seen for this is simply のだ. That's also what you'll find it
under in most dictionaries, and I think it's the closest you'll get to a
standard name.

Sometimes this is written in katakana as ノダ in linguistics (to make the [Use-
Mention Distinction](http://plato.stanford.edu/entries/quotation/#2.2)), as in
the phrase ノダ文.

