He must be working in his office.
他一定在办公室工作呢。
He must be working in his office.
他必定在办公室工作呢。
The light is on. He must be working.
灯亮着，他一定在工作。
He must be working in his class, I think.
我想他一定正在班里。
The light is still on. He must be working in the office now.
灯还亮着，他现在一定还在办公室工作着。
The light is still on. He must be working in the office now.
灯还亮着，他现在一定还在办公室工作着。
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