この問題は思ったより難しいです。

N5 この kono this N5 問題 mondai problem, question N5 より yori than N5 難しい muzukashii difficult

N4 問 mon / to.u, to.i, ton question, ask, problem N4 題 dai topic, subject, sujet 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

N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context 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 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information N5 〜よ yo Sentence ending particle adding information to listener, emphasizes statement, expresses certainty or warning