Expressions (phrases, clauses, etc.), Godan verb with 'ku' ending
to have medicine be effective
運よく薬が効くとき１時過ぎに寝れるけど、薬を飲まないと４時ぐらいまで眠れない。If I'm lucky enough for the medicine to work I can get to sleep after 1am but if I don't take it then I can't sleep until about 4am.
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