Mom is in/on a chair.
Mum sits on the chair；Mum sit on the Chair yesterdayMum has sit one the chair for half an hour；Mum was sitting on the chair when I backed home；可以参照不同的时间和动作的完成和持续有不同的的表达方式。
另外，也可以用不同的词汇来表达：Mum is on the chair；
Mom is in/on a chair.
Mum sits on the chair；Mum sit on the Chair yesterdayMum has sit one the chair for half an hour；Mum was sitting on the chair when I backed home；可以参照不同的时间和动作的完成和持续有不同的的表达方式。
另外，也可以用不同的词汇来表达：Mum is on the chair；
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