Particles can be put before copula だ?


In the anime Relife ep1, I met this line "酔ってた勢いでだ".

I don't know what is で here. Is it an abbreviation, dialect, or particle? Or
this is a casual speech that is ungrammatical?

If it is a particle, can I do that with を,に,へ too? I know that です can be put
after almost everything to make it polite, but not sure about だ.

Thanks.




Yes, they can. It is reasonable to think that the sentence is a cleft sentence
without the subject part.

  * [I don't understand what のも means in 生まれたのも育ったのも京都なんですよ](https://japanese.stackexchange.com/a/19208/45489)

The basic pattern will be XのはYだ/です, where X is a sentence and Y is a phrase.
In your case, it should be something like

  * (私がそんなことを言ったのは)酔った勢いでだ.
  * It is by the 勢い of being drunk (that I said such a thing).

Note () part is just what I guessed, it should be replace as appropriate to
the context.

* * *

Similarly, other particle+だ are possible. A bit artificial example:

  * 彼はあなたに花を贈った He sent you flowers.
  * 彼が花を贈ったのはあなたにだ It was to you that he sent flowers

In case of を or へ, I suppose it is more common to drop the copula in the
sentence like the example:

  * 何を見てるんですか What are you watching?
  * 歩いている人をだ. (It's) Walking people (that I'm watching).

Here colloquially だ and even を would be dropped (=歩いている人).




Yes, they can. It is reasonable to think that the sentence is a cleft sentence
without the subject part.

  * [I don't understand what のも means in 生まれたのも育ったのも京都なんですよ](https://japanese.stackexchange.com/a/19208/45489)

The basic pattern will be XのはYだ/です, where X is a sentence and Y is a phrase.
In your case, it should be something like

  * (私がそんなことを言ったのは)酔った勢いでだ.
  * It is by the 勢い of being drunk (that I said such a thing).

Note () part is just what I guessed, it should be replace as appropriate to
the context.

* * *

Similarly, other particle+だ are possible. A bit artificial example:

  * 彼はあなたに花を贈った He sent you flowers.
  * 彼が花を贈ったのはあなたにだ It was to you that he sent flowers

In case of を or へ, I suppose it is more common to drop the copula in the
sentence like the example:

  * 何を見てるんですか What are you watching?
  * 歩いている人をだ. (It's) Walking people (that I'm watching).

Here colloquially だ and even を would be dropped (=歩いている人).

