SICK
1.I felt sick to my stomach.
2."You look sick, Helen"- said Jeorge.
3.I thought maybe you are sick, because you weren't at work yesterday.
4.Dianna was sick and she needes a doctor.
5.The sick people is usually surrounded by doctors.
ILL
1. Fionna is ill, she has got a flu.
2.She felt ill and she went to the doctor.
3.A familiar headache started and she started feeling ill.
4.Was our teacher ill long?
5.Daisy was ill that morning , so she didn't go to work.