My father is working in the office.
= My father is at work in the office.
My father(dad/daddy) is working(doing his job) in the(his) office.
括号里是可以替换的说法。
My father is working in the office.
My father is working in the office.
祝你学习进步，更上一层楼(*^__^*)
My father is working in office.
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