diff --git a/🔰 Grammar/Must (not).md b/🔰 Grammar/Obligation.md
similarity index 63%
rename from 🔰 Grammar/Must (not).md
rename to 🔰 Grammar/Obligation.md
index 308506c..55a9073 100644
--- a/🔰 Grammar/Must (not).md	
+++ b/🔰 Grammar/Obligation.md	
@@ -1,4 +1,4 @@
-# Must & must Not
+# Obligation
 
 ## が必要・必要がある
 
@@ -13,6 +13,28 @@ Means "needed" or "necessary".
 > 今日はパン{屋|や}に行く==必要がない==。
 > No need to go to the bakery today.
 
+## わけにはいかない
+
+Used with verbs for a meaning of "cannot do" (which cannot be your inability, but an external factor).
+Used with verbs in negative form (ない) for a meaning of "cannot be avoided".
+Can be used as わけはいかない or わけにはいきません.
+
+> [!info] Example
+> {今日|きょう}の{弟|おとうと}の{誕生日|たんじょうび}に行か==ないわけにはいかない==だから、{飲|の}み{会|かい}に行かない。
+> There's no way I don't go to my younger brother's birthday today, so I won't go to the afterwork.
+> 
+> {本当|ほんとう}に飲み会に行く==わけにはいかない==よ。
+> There's really no way I can go to the afterwork.
+
+## ずにはいられない
+
+Means "can't help but do something".
+Made with a verb in the negative form (ない) without the ない ending and adding ずにはいられない. 
+
+> [!info] Example
+> {悲|かな}しいのでアイスクリーム食べ==ずには入れれない==。
+> I'm sad so I can't help but eat ice cream.
+
 ## Must
 
 ### なくちゃ・なきゃ
@@ -52,6 +74,29 @@ In casual contexts, can be shortened as ないと.
 > 今日は{勉強|べんきょう}し==ないといけない==。
 > I have to study today.
 
+## べきだ
+
+Means "should do", "must do".
+Used with verbs.
+する can be used as するべき or すべき.
+
+> [!info] Example
+> {来週|らいしゅう}{試験|しけん}があるので{勉強|べんきょう}す==べきです==。
+> There is an exam next week, so I should study.
+
+## てからでないと
+
+Means "must first do". The second part becomes possible after the first one.
+Used with a verb in て form, with からでないと or からでないければ.
+
+> [!info] Example
+> {払|はら}==ってからでないと=={入|はい}るができること。
+> You can enter only after paying.
+
+
+🛠🛠🛠🛠
+Todo: new notions!
+
 ### Comparing いけない and ならない
 
 * ==いけない== is the standardly used form. It implies a subjective view, that it would be better to do something, to avoid negative consequences (eg: brushing one's teeth, eating well, etc).
@@ -96,3 +141,31 @@ Can also be used as なくていい.
 > [!info] Example
 > 今日はレストランで{手伝|て|つ}わ==なくてもいい==。
 > You don't have to help out at the restaurant today (it's okay if you don't help at the restaurant today).
+
+## べきではない・べきじゃない
+
+The contrary of べきだ is べきではない・べきじゃない.
+
+> [!info] Example
+> {泥|どろ}を食べる==べきではない==。
+> You should not eat mud.
+
+
+
+
+
+
+
+
+# TODO
+
+## ないと
+
+
+
+
+
+must do; unless/if you don't ~
+
+https://jlptsensei.com/learn-japanese-grammar/%e3%81%aa%e3%81%84%e3%81%a8-naito-meaning/
+https://bunpro.jp/grammar_points/%E3%81%AA%E3%81%84%E3%81%A8