Even though yesterday is not an adverb, we say:

I played golf yesterday.

only because the preposition, on, is dropped before yesterday. In that on yesterday becomes a prepositional phrase that modifies played:

I played golf (on) yesterday.

That preposition dropping is a rule. What about Japanese sentences like:


Grammatically, is there really a particle after 昨日 such as:

昨日 (では) ゴルフやった。
昨日 (に) ゴルフやった。

In speaking, you pause instead of saying the particle, but in official writing, are those possible particles after 昨日 written (instead of a comma)?

Of course, this is not limited to just 昨日 such as:


In English legal contracts, every last preposition and comma are triple checked because they can make such a huge difference in any sort of dispute.

Now, Japanese commas seem to be void of specificity and thus open to "interpretation" by the counterparties / judge / arbiter, right? With big $ on the line, the counterparties must specify exactly what they are agreeing to, and you can't do that with commas???

  • I don't think 'on yesterday' is actually grammatical and if you look up 'yesterday' in a dictionary it's classified as an adverb in addition to a noun
    – Angelos
    Jun 11, 2023 at 13:04

1 Answer 1


No, you won't see any case particle after following words, official or not, as long as they're used to indicate the time when the sentence takes place on/in, because they are completely adverbial in this usage.

  • 昨日, 今日, 明日 etc.
  • 先週, 今週, 来週 etc.
  • 先月, 今月, 来月 etc.
  • 前期, 今期, 来期 etc.
  • 去年, 今年, 来年 etc.
  • 今朝, 明朝, 昨晩, 今晩, 今夜 etc.
  • 毎日, 毎週, 毎月, 毎年 etc.

今晩(× に)荷物が届きそうだ。
今日(× に)荷物が届きそうだ。
今週(× に)荷物が届きそうだ。

Of course, if you use those words in other ways, you must put right particles.

今日仕事が終わる。 (by today)
今日にも荷物が届きそうだ。 (any day now)
今日()荷物が届きそうだ。 (particles other than case aren't affected)

  • 毎日とか毎年とかの「毎~」も加えられます?
    – chocolate
    Dec 29, 2020 at 17:34
  • @Chocolate なるほど~、ではそれも。ありがとうございます Dec 30, 2020 at 10:03

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .