I've seen some sentences end with particles like _が_ and _で_. The most common
particle that I see is _に_. For example, if someone asked:

> どこにいる？ → Where are you?

I could reply,

> 友達{ともだち}の家{いえ}に → (I'm at) my friend's house.

I'm still lost on the particles _で_ , and _が_. Help would really be
appreciated if someone could explain how those two particles are used at the
end of a sentence.
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2016-06-03T01:31:02.583
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2016-06-03T02:09:16.837
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question
particles particle-が particle-で
Particle at the end of a sentence
This is essentially an omission of a word, in this case being the verb
following the particle. This is common in speech as answers to questions, and
often involves omission of the main verb of a sentence.

> どこにいる？
>
> 友達の家に（いる。）

* * *

> 誰が勝ったか？
>
> 俺が（勝った。）

* * *

> 何語で話しかけられた？
>
> 英語で（話しかけられた。）

It is also common, in speech, to add a similar clause _after_ the verb has
been spoken. This can be done for clarification. This pattern does not require
the sentence to be an answer to a question and can just be added by the
speaker in anticipation of the listener not getting the full picture.

> A: 登録しました。
>
> B: （何を？）
>
> A: 名前を
>
> B: （どこに？）
>
> A: データベースに
>
> B: （何で？）
>
> A: SQLクエリーで
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2016-06-03T02:09:16.837
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2016-06-03T02:09:16.837
2020-06-17T08:18:27.500
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answer