diff --git a/10-Input/Classes/Japanese Class_2026-04-01.md b/10-Input/Classes/Japanese Class_2026-04-01.md
index ca4ae15..78e297b 100644
--- a/10-Input/Classes/Japanese Class_2026-04-01.md	
+++ b/10-Input/Classes/Japanese Class_2026-04-01.md	
@@ -9,6 +9,7 @@
 - 薄着 -> うすぎ -> Thin Clothes (Summer Clothes)
 - 厚着 -> あつぎ -> Thick Clothes (Winter Clothes)
 - 記憶喪失 -> きおくそうしつ -> Memory Loss
+- 離陸する -> りりくする -> To Take off (like in an airplane)
 
 # Main Point
 ## 疑問詞 -> ぎもんし -> Interrogative Words
@@ -45,10 +46,12 @@ Can add どうか after the か to mean "or not". Kind of same meaning, just add
 	- I don't remember if the accident happened or not
 - ここはどこか、私は誰か、どうしてここにいるか、かぞくがいるか、おぼえていません
 	- I do not remember where I am, who I am, why I am here, or if I have a family.
-- 
+- 私はA-さんがどこにいるか、わかりません
+- B-さんが卒業したかどうか、知りません
+	- I don't know whether B-san graduated or not.
 
 # Supplementary Notes
-- 
+	- For 知っている, we can only use ています in the affirmative, not in the negative. 
 
 # Homework
 -