The light is on. He must be working.
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he must be working
他一定在工作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He must be working in his office.
他一定在办公室工作呢。
youdao
他必定在办公室工作呢。
灯亮着，他一定在工作。
He says he has worn it for two days and figures it must be working because he has not come down with the flu.
VOA: standard.2009.04.30
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