## What's the difference between に and で when speaking of time of an action?

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What's the difference between に and で when speaking of the time of an action? I know に is very specific about time, but I'm not sure when, or how to use で. Can で only be used in certain instances?

Supposing we want to say "After eating breakfast, I will watch TV." What would be the difference between these two:

vs.

Thanks!

3Ooh, good question! +1 – Amanda S – 2011-06-07T00:55:52.253

3My Japanese teacher in college taught me it's always ~た後で without exception... ... ...except I've heard plenty of Japanese people use the に version, so I'm not sure anymore. Although I'll still use ~た後で because that what I was taught. – istrasci – 2011-06-07T01:50:25.400

1And I'd like to add that I have never heard of 先で, only 先に, even though 先 is opposite of 後. – Lukman – 2011-06-07T05:32:42.713

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Related: に vs で again: 前に vs 後で.

– Tsuyoshi Ito – 2011-07-26T17:27:36.183

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There are some interesting connotations in the Chiebukuro examples crunchyt kindly pointed to which I think are worth going over in more detail. First, the ～でする and ～にする forms:

この仕事はあとします。 I'll do this job later.

この仕事はあとします。 I'll do this job later.

Now, the fact that these are both allowable and both have the same (English) translation doesn't mean they're freely interchangeable. Rather, the first simply means that you'll do the job sometime in the future. The second, however, implies that you have the option of doing the job now, but you're putting it off until later -- "you choose 'later' from amongst other options," as crunchyt put it. (Incidentally, the Japanese word for "postponement" is 後回し. Yet the opposite of "postponement" is not 前回し, but 前倒し. In Japanese, things rotate backward and fall forward. :)

Now for verbs other than する, で is the typical choice to follow あと. From Chiebukuro:

ご飯はあと食べます。 I'll eat later.

ご飯はあと食べます。 (incorrect)

But what of the ～たあと form? If you Google for such phrases as 食べたあとで versus 食べたあとに, you end up with the same number (~8M) of results. Clearly both are used commonly. What do we make of this?

Recall that に refers, as you know, to a specific point in time. で, on the other hand, is more general, and indicates a range of time within which an action takes place. For example:

この本を３時間読み終わった。 I finished reading this book in three hours.

この本を３時間読み終わった。 (incorrect)

From this contrast of specificity/generality we can conclude that ～たあとに shows a tighter bond between the two actions, i.e. the second action takes place very close to the end of the first. ～たあとで, by giving a range of time, is much less specific about when the second action starts.

This rule of "immediate versus range" also applies to cases where the word preceding あと is not a verb, but one of この, その, or あの:

このあとに [right] after this

このあとで [sometime] after this

There are of course cases when neither ～あとに nor ～あとで may be used, such as when the first action is a prerequisite for the second:

Or when the first action has a direct cause-and-effect relationship with the second:

このボタンを｛押したら／押すと｝お湯が出ます。 (not ボタンを押したあとで)

2+1 for this gem --- "In Japanese, things rotate backward and fall forward." – crunchyt – 2011-06-20T01:10:42.900

1This was also great --- "～たあとに shows a tighter bond between the two actions, i.e. the second action takes place very close to the end of the first. " – crunchyt – 2011-06-20T01:12:48.157

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I agree with Amanda, a great question. To summarise with regard to 'time':

"後で" means you are using the time you have later to do the action, whereas...

"後に" implies you choose "later" from amongst other options (e.g. instead of 'now', 'never' or even 'undefined') for performing the action (i.e. eating).

I found the answer here on Chiebukuro http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1433341164

There are 2 examples given on Chiekbukuro as representative of the differences. They are「手で入れる」 and 「手に入れる」. With 「で」 it means you do the action "with your hand", whereas 「に」 indicates your hand is where the action comes to completion (the 帰着点 in Japanese).

So with regard to the question:

「で」is used to indicate the time or space used to perform the action

「に」indicates the time/place inside which completion of the action occurs.

NB: I have not covered the more common usage of に that does not relate to the question (e.g. 電車に乗る). I ♡ Chiekbukoro

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(1) 朝ご飯を食べた後テレビを見る。
(2) 朝ご飯を食べた後テレビを見る。

I think it is a very interesting question. (+1)
There are various answers about the difference between "に" and "で", but I'll answer the difference only between the examples given by the questioner.

(1) and (2) seem to have the same meaning at first glance and I could understand the meaning. However, (2) is correct as Japanese, but (1) is not perfectly correct.

Strictly speaking, (2) shows the "situation" after eating breakfast, not "time", and (1) may imply the "time" or "condition" after eating breakfast.

(2) is a good Japanese as it is because the "situation" is well described, but (1) is insufficient because the "time" or "condition" is not well described.

(1) will become correct Japanese if added with the expression of time or condition as follows.

(1)-1 朝ご飯を食べた後すぐ/すぐにテレビを見る。
(1)-2 朝ご飯を食べた後食卓{しょくたく}を片付｛かたづ｝けてから/お茶碗｛ちゃわん｝を洗｛あら｝ってからテレビを見る。
(1)-3 朝ご飯を食べた後お茶碗を洗いながらテレビを見る。
(1)-4 朝ご飯を食べた後９時｛じ｝までテレビを見る。
(1)-5 朝ご飯を食べた後に別｛べつ｝の部屋｛へや｝でテレビを見る。
(1)-6 朝ご飯を食べた後に家族｛かぞく｝と/家族と一緒{いっしょ}にテレビを見る。

？？　 (2) is correct as Japanese, but (1) is not perfectly correct. って書いてあるから、2は正しくて、1は正しくないんですよね？　でもその下に(1) is good Japanese as it is... but (2) is insufficient... (2) will become correct Japanese if っていうのは・・・？ – Chocolate – 2018-02-14T07:04:41.067

@Schokolade: とんでもない馬鹿ですね。ご指摘ありがとうございます。早速修正致しました。 – mackygoo – 2018-02-14T08:12:17.233