raining now. → It is raining now, isn’t it?

正在下雨。→ 正在下雨，對嗎？

Your father isn’t working today. → Your father isn’t working today, is he?

你父親今天不工作。→ 你父親今天不工作，對嗎？

The students are visiting the museum. → The students are visiting the museum, aren’t they?

學生們正在參觀博物館。→ 學生們正在參觀博物館，對嗎？