1. I went to hospital to have a health checkup.
2. I went to the hospital to have a health checkup.
3. I went to a hospital to have a health checkup.
(Which one is correct? Do I have to use article or not?)
2. I went to the hospital to have a health checkup.
3. I went to a hospital to have a health checkup.
(Which one is correct? Do I have to use article or not?)