56451
> ロビーが満員 **で** 入室できませんでした
>
> 悩み事 **で** 眠れない

Does this で mean "because"? If so, can it be replaced by だから、なので and/or
だということで? (I think that で in the first sentence is supposed to be だ/です, but can
it be translated as "because"?)

I think that に can also mean "because" at times, would it work this time?

> ロビーが満員 **に** 入室できませんでした
>
> 悩み事 **に** 眠れない

Regarding the second sentence, is the で used the same (だ/です)?

As you can see, I'm a bit confused with all these way of saying the same
thing.
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2018-02-06T20:56:47.510
56446
2018-02-07T18:38:36.917
20501
question
grammar
Questions regarding で, に
`で` can be used to represent causal relationships in a similar way to _some_
english uses of `because`, although I am hesitant to say that `で`=`because`.
Your two uses of `に` do not really work; I would stay away from trying to use
`に` as "because" in most cases.

Let's talk about `で` though. You've actually picked two very good examples,
because although the `で` in each of them is representing a causal
relationship, they do so in different ways.

> ロビーが満員で入室できませんでした

This `で` is an abbreviated `であり`. You can read more about this
[here](https://japanese.stackexchange.com/questions/42454/what-is-the-meaning-
of-%E3%81%A7-in-this-sentence?), but this is very close to an English `and`,
and it can be used to represent causal relationships in a similar way.

> ロビーが満員であり、入室できませんでした
>
> The lobby was full (of people) and I could not get in.

No `because` necessary. Also note that `ロビー` is `lobby`, not `room`.

As for

> 悩み事で眠れない

This is the `で` particle we know and love. `悩み事` is the thing directly
facilitating somebody not sleeping, in the way that the plane in `飛行機で行く`
directly facilitates your traveling.

I think it's safe to translate this as "I could not sleep _because_ of my
worries", but I encourage you to think of this more as a natural extension of
the way `で` is used than as it corresponding directly to `because`.

Edit: It might be best to think of `because of`, rather than just `because`,
as the possible translation for `で` here. It really only plays this role with
nouns, which in English will end up as `because of [noun]`.
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2018-02-06T23:50:06.713
56451
2018-02-07T18:38:36.917
2020-06-17T08:18:27.500
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56446
answer