母(はは) hahaは wa先(せん)月(げつ) sengetsuから kara病(びょう)気(き) byoukiだ da。 My mother has been sick since last month. Literal Mother [topic-は] last-month [from-から] sick 先月から病気だ = 'has been sick since last month.' から marks the starting point. No ている needed — the copula だ with a temporal から already implies the state continues. familyhealth
母(はは) hahaは wa先(せん)月(げつ) sengetsuから kara病(びょう)気(き) byoukiだ da。 My mother has been sick since last month. Literal Mother [topic-は] last-month [from-から] sick 先月から病気だ = 'has been sick since last month.' から marks the starting point. No ている needed — the copula だ with a temporal から already implies the state continues. familyhealth