# Time: regularity

## たびに

<div class="usage">
<div class="left">
	<p><span class="box">V (dictionary)</span></p>
	<p><span class="box">N + の</span></p>
</div>
	<p class="right">+ たびに</p>
</div>

Means "whenever", "every time".

> [!info] Example
> {犬|いぬ}を{見|み}る==たびに=={幸|しあわ}せになる。
> Whenever I see a dog, I feel happy.

## おきに

Means "every other". This is used for repeated intervals, after a noun indicating something measurable.

> [!info] Example
> この電車は４分==おきに=={出発|しゅ|っぱつ}します。
> This train leaves every four minutes.

## ごとに

<div class="usage">
<div class="left">
	<p><span class="box">V (dictionary)</span></p>
	<p><span class="box">N</span></p>
</div>
	<p class="right">+ ごとに</p>
</div>

Means "each", "every". Used for intervals.

> [!info] Example
> {彼女|かのじょ}に{会|あ}う==ごとに==、{心|こころ}がドキドキする。
> Every time I see her, my heart pounds.

## おきに vs ごとに

The way the intervals are counted between these two grammar structure is different.
* おきに refers to what is _inside_ the interval.
* ごとに refers to the interval _per se_.

> [!info] Example
> １日==おきに== =２日==ごとに== = every other day = every second day
> ●○●○●○●
>
> ２日==おきに== =３日==ごとに== = every three days = every third day
> ●○○●○○●○○●