Added all N2 notions

🔰 Grammar/Advice - Guidance - Proposition.md

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+# Advice, guidance, proposition
+
+## たらどう
+
+Used to ask about a situation, usually to give advice. Translates to "why don't you" or "how about".
+Used with the たら form of verbs.
+
+> [!info] Example
+> ゲームをし==たらどう==か。
+> How about you play a game?
+
+## たらいいですか
+
+Used to ask about an advice or instructions. Translates to "what should I do".
+Used with the たら form of verbs.
+
+> [!info] Example
+> 何を{飲|の}ん==だらいいですか==。
+> What should I drink?
+
+## ことだ
+
+Means "should do". It is used for suggestion or giving advice in spoken language.
+Used after verbs with a る or ない ending.
+
+> [!info] Example
+> {砂糖|さとう}が{多|おお}すぎる{食|た}べ{物|もの}を{食|た}べない==ことだ==。
+> You shouldn't eat food that is too high in sugar.
+
+## ようではないか
+
+Means "why don't we", "shall we", "let's do". Used with a verb in the volitional form (おう). ではないか can be replaced by じゃないか.
+
+> [!info] Examples
+> {一緒|いっしょ}に{飲|の}==もうではないか==。
+> Why don't we have drinks together?