椅怎么读

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；