思っていたより難しくなかったので安心したよ

N5 より yori than N3 難 nan difficulty, hardships, defect N4 安心 anshin relief, peace of mind

N4 思 shi / omo.u, omoera.ku, obo.su think, penser, pensar N3 難 nan / kata.i, -gata.i, muzuka.shii, muzuka.shii, mutsuka.shii, -niku.i difficult, impossible, trouble N4 安 an / yasu.i, yasu.maru, yasu, yasu.raka relax, cheap, low N4 心 shin / kokoro, -gokoro heart, mind, spirit

N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition 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 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options N5 〜よ yo Sentence ending particle adding information to listener, emphasizes statement, expresses certainty or warning