My mother is ill in hospital.或My mother was ill in hospital.
生病不用完成时态，一般现在时或一般过去时就好
My mother has been ill in a hospital.
my mom was ill in hospital
My mather has been ill in hospital
my
mother
is
in
hospital
in
hospital
表生病
in
the
hospital
表在医院，不一定生病，也可以是工作
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