Grammar Info
N4 Lesson 2: 14/17

毎(ごと)に
Each, Every, At intervals of

Structure
Verb + ごとに
Noun + ごとに
Details
Register Standard
使用域 一般
Information
ごとに is an combination of the noun ごと, and the particle . Together, they are used adverbially to express that something happens ‘every (A)’, or ‘at intervals of (A)’. ごとに may be used after any verb (usually in non-past form), or noun.
  • 私(わたし)彼(かれ)会(あ)ごとに、「何(なに)食(た)べたい?」聞(き)かれます
    Everytime I see him, he asks me ‘What do you want to eat?’
  • 私(わたし)3時間(じかん)ごとにお菓子(かし)食(た)べます
    I eat snacks every 3 hours.
Although ごとに may be used after verbs, the most common use is with nouns, or phrases that finish with nouns.
Caution
ごと is the 訓読(くんよ)み (Japanese reading) of the kanji 毎(まい), which means ‘every’. This fact will be important when trying to remember the difference between ごとに, and おきに, a similar grammar point which also means ‘every’, but focuses more on ‘intervals’. Due to おきに focusing on the space between ‘each’, there are sentences where おきに and ごとに will have different meanings.
  • 私(わたし)一週間(いっしゅうかん)ごとに実家(いえ)に帰(かえ)ります
    I go to my parents' home every week. (Every single one)
  • 私(わたし)一週間(いっしゅうかん)おきに実家(いえ)帰(かえ)り ます
    I go to my parents' home every other week. (Every single interval of one)
Here, we can see that ごとに will mean ‘every week’, but おきに will mean ‘every second week’. due to there being a ‘one week interval’ when おきに is used. To make things easier, these two expressions can be remembered in the following way.
(A) ごとに = Every (A)
(A) おきに = Every spaced repetition of (A)
Fun Fact
Many native speakers make mistakes with the difference between おきに and ごとに, so there are quite a large number of people (especially in the younger generation) that will consider them completely interchangeable.
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彼女(かのじょ)運転中(うんてんちゅう)、赤信号(あかしんごう)ごとに、携帯(けいたい)見(み)る
She looks at her phone at every red light while driving.
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出(で)かけるごとに忘(わす)れ物(もの)する
Every time I go out I forget something.
夏(なつ)ごとにアメリカ帰(かえ)ります
Every summer I go back to America.
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Books
[DBJG] A Dictionary of Basic Japanese Grammar
Page 128