patients go to hospital ( not the hospital) . and My parents go to the hospital to visit their friend ( their friend is a patient). So what about doctor?
the same with teacher and school? police and prison-house?
Could you please tell me what is correct?
A comparison can be made here.
1- ( Talking about a baby) Does she go to school?(in general sense) ~ Yes, she is in...
2- My mum is at the school now to.... ( A specific place/ building)
1- His brother has been in prison for 14 years. (He's under going a punishment. It doesn't matter which prison.)
2- The Prime Minister visited the Prison last week and ... ( a specific place/ building)
Hope this helps.