Added all N3 notions

🔰 Grammar/Time - surprise.md

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+# Time: surprise
+
+## 急に
+
+{急|きゅう}に means that something happened unexpectedly or quickly.
+
+> [!info] Example
+> ==急に==電車が{現|あらわ}れた。
+> A train suddenly appeared.
+
+## ふと
+
+This means "suddenly", "unexpectedly", "unintentionally". Emphasis is on the lack of intention.
+
+> [!info] Example
+> ==ふと=={通|とお}りに１０００円を{見|み}つけた。
+> I found 1000 yen on the street by chance.
+
+## たとたん
+
+Means "just as". Used for an action that happens just at the moment something else occurs. Can convey a nuance of something unexpected or surprising.
+Used with verbs in the past form (た).
+
+> [!info] Example
+> {部屋|へや}を{掃除|そうじ}し==たとたん==、うちの{猫|ねこ}が{吐|は}いてしまった。
+> As soon as I cleaned my room, my cat vomited.