in a hospital 和 in the hospital 有什么区别？ in the be

in a hospital 和 in the hospital 有什么区别？ in the bed 和 in bed有什么区别

in hospital指生病住院的意思，she is in hospital就是指她在住院。
in the hospital是指在医院里做事情，这个事情并没有范围，比如说she works in the hospital,she lives in the hospital.
in bed是指卧病在床或者睡觉的意思。she is in bed.一般是以on the bed来表示在床上，没有睡觉

in hospital是住院 in the hospital 是在医院