利益を出し続けるのは難しい

N3 利益 rieki profit, benefit, gain N3 出 de outflow, coming (going) out, graduate (of) N4 続ける tsudzukeru continue, keep doing N5 難しい muzukashii difficult

N3 利 ri / ki.ku profit, advantage, benefit N1 益 eki, yaku / ma.su benefit, gain, profit N5 出 shutsu, sui / de.ru, -de, da.su, -da.su, i.deru, i.dasu exit, leave, go out N3 続 zoku, shoku, kou, kyou / tsuzu.ku, tsuzu.keru, tsugu.nai continue, series, sequel N3 難 nan / kata.i, -gata.i, muzuka.shii, muzuka.shii, mutsuka.shii, -niku.i difficult, impossible, trouble

N4 〜続ける tsuzukeru Indicates continuation of an action over time, attaches to the verb stem, means continue doing 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 〜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