どうして来ませんでしたか。

N5 どうして doushite why N3 来 rai next, coming, prefix for time

N5 来 rai, tai / ku.ru, kita.ru, kita.su, ki.tasu, ki.taru, ki, ko come, due, next

N5 〜ませんか masen ka Polite invitation using negative question form, equivalent to wont you do something with me N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context N4 〜ので node Indicates cause or reason in a softer way than kara, connects two clauses, often used in polite explanations N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options