彼女の大部分の時間を勉強に費やしてる

N5 彼女 kanojo she N3 大部分 daibubun most part, large portion N5 時間 jikan time N5 勉強 benkyou study, learning

N3 費 hi / tsui.yasu, tsui.eru expense, cost, spend

N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition depending on context N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase