When your head is not good, you say I have a headache. When your body is very warm, you say I have a fever. Both words go after have a.
I have a headache.
headache — I have a headache.
fever — My son has a fever.
Try it: Lars: How are you today? Maya: Not good. I have _____. Complete what Maya says. (a fever / a headache / a bad back) Answer: a fever — She is in bed and a big thermometer lies beside her, and a thermometer is how you show a very warm body: a fever. Nothing in the picture points at her head for a headache, and nothing points at her back for a bad back.
It hurts.
Point at the part and say It hurts. The doctor asks Where does it hurt? and you show the part.
It hurts — My leg. It hurts.
Try it: _____ Right here. (It hurts. / I have a fever. / My head hurts.) Answer: It hurts. — Both of her hands are on one leg and her face shows pain, so she points at that part and says It hurts. Her hands are nowhere near her head for My head hurts., and there is no thermometer in the picture for I have a fever.
At the clinic
The doctor gives you medicine to take at home. For a day and a time with the doctor, you have an appointment.
medicine — Take this medicine.
appointment — I have an appointment at four.
Try it: Nurse: Good morning. What do you need today? Farid: I am here for my _____. Complete what Farid says. (appointment / medicine / headache) Answer: appointment — The diary is open on the clinic desk and one time on the page is ringed, so what Farid is here for is his appointment. medicine is something you take, and a headache is a pain in your head; a ringed time on a page is neither of those.