Because (& Why)

x## How to say “Why”
There are three ways to say “why” in Japanese:

“Why”	Informal	Formal	Super Formal	Comments
なんで	✅	❌	❌
どうして	✅	✅	❌
なぜ	❌	❌	✅	For academic and poetic writing only

How to say “Because”

There are five ways to say “because” in Japanese:

“Because”	Informal	Semi-Formal	Formal	Na-Adj & Noun Modification	Verb in plain form?	Nuances
から	✅	✅	(✅)	だから	❌	(Semi-)formally can be used for quick replies with just the reason.
ですから/ ますから	❌	✅	❌	❌	❌	Neighbours, friends’ parents, friendly colleagues, etc. When using “let’s …”
ので	❌	❌	✅	なので	✅	Meant when the reason is “objective” instead of “subjective”. You really should use this when owning up for your mistake.
からです	❌	❌	✅	だからです	✅	Usually used in interview/academic settings. Sounds formal, factual and pedantically correct. And so when used in a casual setting it can be rude, because it sounds like you’re teaching/explaining something to someone (e.g. “duh”).
だから	✅					Technically means “so/that’s why”.だから, only can be used at the start of the sentence.

The reason comes before the statement. However, it’s colloquially okay to use it after the sentence since you may not have the reason in your first when speaking.