Which list includes several warning signs for clinical depression?

feelings of sadness, hopelessness, and despair loss of ability to concentrate, sleep, or perform at school or work repeated thoughts of death and suicide.

Hope this helps.( :

Well some of the symptoms of clinical depression are loss of interest in things liked before, excessive loss or gain of sleep, always down or angry, appetite may change, energy-loss, concentration issues which may lead to worsened grades. And in some cases thoughts of suicide may occur.