Particle, Conjunction
because; as; since; so; therefore
なので after nouns or na-adjectives; more objective and slightly more formal than からsee なので
とても暗いので私は本が読めない。It is too dark for me to read. Conjunction
because of that; therefore; accordingly; consequently; on those grounds; that is why; for that reason
at sentence beginning; dated or colloquial
Also written んで