69667
I've seen a lot of sentences where `で` was omitted, like:

> 今朝サンタさんが来なかった

Here we have `今朝` which is a point in time so the sentence should be:

> 今朝 **で** サンタさんが来なかった

But it's not. Is there any difference in meaning between these two sentences?
Is sentence #2 grammatically wrong? Are there any other particles(?) which can
be omitted in the same way?

Also what if it were written this way?

> サンタさんが今朝 **で** 来なかった

Does it have a new (#3) meaning in contrast to the previous ones?
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2019-07-23T15:07:29.880
69660
2019-08-28T17:00:57.593
2019-08-28T17:00:57.593
-1
9205
question
adjectives particle-で nouns
Is で unnecessary for time references or does direct noun modification have different connotations?
In Japanese, the use of particles for time references is generally predicted
by whether the time reference is **fixed** or **relative**. For fixed time
references, the particle `に` is used to mark the time word. For relative time
references, the particle is usually omitted.

Examples of **fixed** time references are named days, times, dates, years,
etc.  
Examples of **relative** time references are things like 'today', 'yesterday',
'this morning', 'next week', etc.

Moving specifically to your example, you haven't included the meaning you are
attempting to translate into Japanese. I am assuming you intended the meaning
"Santa didn't come this morning". If so, your example contains a relative time
reference ('this morning') and therefore the particle can be omitted.

> 今朝サンタさんが来なかった。(This is grammatically acceptable for the meaning "Santa did
> not come this morning").

If, on the other hand, you were using a fixed time reference, the sentence
would be something like this:

> 12月25日 **に** サンタさんが来なかった。 (the particle に is need for a fixed time
> reference).

_I could add that 今朝で is not actually grammatically incorrect in itself, but
it introduces a different meaning than what I assume you intended. 今朝で would
be like 'as of this morning' in English, referencing a time period before and
up to the stated time. But when using particles to connect events to times
('on' a day or date, 'at' a time, etc), the particle に is used in Japanese._
CC BY-SA 4.0
2019-07-23T18:42:30.753
69667
2019-07-24T12:19:59.250
2019-07-24T12:19:59.250
25875
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69660
answer