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I've been trying to understand those two particles when applied to these
phrases:

>   1. 私は朝ご飯にお茶を飲みます
>   2. 私は朝ご飯でお茶を飲みます
>   3. 私は朝ご飯の時にお茶を飲みます
>

What I more or less understand is:

>   1. the only/main thing I have for breakfast
>   2. at breakfast time, but not at any other time
>   3. at breakfast time, but not restricted to that time.
>

So, my questions are:

  * What general function does に fulfill in sentence 1 (specific time, direction...)? 
  * Is, in sentence 1, 朝ご飯 functioning as a time expression? 
  * In sentence 2, is 朝ご飯 functioning as a time expression and じ indicating a restrictive period of time?
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2014-07-13T11:35:31.443
17783
2019-03-14T08:49:02.110
2019-03-14T08:45:14.167
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question
word-choice に-and-で
Still trying to get my head around に and で
In sentence 1, に is not functioning as a time expression. It's like _for_ or
_as_. "I have green tea **for** breakfast."

で when used as a time particle can indicate:

  1. the age at which something was done: ２５歳で日本に行きました。 _At the age of 25 I went to Japan._

  2. the end point of a period of time: １時間で宿題を終えた。 _I finished my homework in/after an hour._  
Neither of these apply in sentence 2 so 朝ごはん is not functioning as a time
expression. The で is showing that 朝ごはん is the place/setting where the tea-
drinking is taking place.

In sentence 3, 朝ごはん itself is not a time expression, but together with 時 (とき
not じ）you get 朝ごはんの時 'the time of breakfast' or 'breakfast time'.

> Only one doubt I have: what does に indicate in the first sentence?

In sentence 1 に means _for_ or _as_. It functions like として.
CC BY-SA 4.0
2014-07-13T15:03:28.157
17784
2019-03-14T08:49:02.110
2019-03-14T08:49:02.110
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answer