雨が降るのを知りませんでした。

N5 雨 ame rain N5 降る furu fall from sky, rain, snow

N5 雨 u / ame, ama-, -same rain, pluie, lluvia N3 降 kou, go / o.riru, o.rosu, fu.ru, fu.ri, kuda.ru, kuda.su descend, precipitate, fall N4 知 chi / shi.ru, shi.raseru know, wisdom, savoir

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 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase