"vault backup: 2026-04-02 21:47:07 from Flow"

20-Knowledge/Synthesized-Japanese-Class-Notes.md

@@ -301,6 +301,19 @@ This is a fundamental concept in Japanese grammar that distinguishes between ver
 - **"No Need To" (〜なくてもいいです)** - *Added: 2025-12-04*: Expresses that there is no necessity to do an action. Formed from the negative `ない` form.
     - *Example: 日曜日は早く起きなくてもいいです。* (On Sundays, it's okay to not wake up early.)
 
+- **Embedded Question - *Added: 2026-04-01***: Used to insert a question (who, what, where, when, why) into a sentence. 
+    - **Structure**: [Question in Plain Form] + か + [Main Verb]
+    - *Example: ビールをなんぼんのんだか、わかりません。* (I don't know how many beers I drank.)
+    - *Example: どこにすんでいるか、おしえてください。* (Please tell me where you live.)
+    - *Example: いつかいぎがあるか、しっていますか。* (Do you know when the meeting is?)
+    - **Note**: For **Noun** or **な-Adjectives**, drop the "だ" before adding か. *Example: どこが不便か、教えてください。*
+
+- **Whether or Not (かどうか) - *Added: 2026-04-01***: Used for Yes/No questions within a sentence when there is no interrogative word.
+    - **Structure**: [Plain Form] + かどうか + [Main Verb]
+    - *Example: 私が結婚しているかどうか、わかりません。* (I don't know whether or not I am married.)
+    - *Example: 家族がいるかどうか、わかりません。* (I don't know if I have family or not.)
+    - *Example: 事故に遭ったかどうか、覚えっていません* (I don't remember if the accident happened or not.)
+
 - **Instead of (Verb + ないで) - *Added: 2026-03-23***: Used to express doing one action instead of another.
     - **Structure**: [Thing you didn't do] + V+ないで + [Thing you did instead]
     - **Examples**:
@@ -658,6 +671,11 @@ Compare this with an い-adjective like `太い` (futoi), which means "thick" or
 - **描く (かく) - *Added: 2026-03-04*** - To Draw
 - **行列します (ぎょうれつします) - *Added: 2026-03-04*** - To line up
 - **がる - *Added: 2026-03-11*** - To feel (suffix/verb)
+- **学習する (がくしゅうする)** - To learn - 2026-04-01
+- **離陸する (りりくする)** - To take off (airplane) - 2026-04-01
+- **着陸する (ちゃくりくする)** - To land (airplane) - 2026-04-01
+- **間違う (まちがう)** - To make a mistake - 2026-04-01
+- **招待する (しょうたいする)** - To invite - 2026-04-01
 
 ### Adjectives
 
@@ -679,6 +697,7 @@ Compare this with an い-adjective like `太い` (futoi), which means "thick" or
 - **頭がぼうっとします** - My head feels foggy
 - **遠慮しておきます (えんりょしておきます)** - *Added: 2026-03-11* - Decline an invitation ("I'll be reserved")
 - **遠慮しないでください (えんりょしないでください)** - *Added: 2026-03-11* - Don't worry about it ("Don't be reserved")
+- **到着 (とうちゃく)** - Arrival - 2026-04-01
 
 ## Phrases & Greetings