Added all N3 notions

🔰 Grammar/Time - regularity.md

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+# 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)  
+> ●○○●○○●○○●