$2.$ I need something for a sore throat.
- S + need + N/ to V.
$3.$ It ('s) really hurt.
- S + tobe + adj.
$4.$ Do you have a headache too?
- Do/ Does + S + V (Bare)?
$5.$ How many (+ Plural Nouns) do I take?
$6.$ How often should I take it?
- Should + S + V (Bare)?
$7.$ Are you allergic to any medicine?
- Is/ Are + S + adj?
- allergic to something.
$8.$ I'm afraid that you need a prescription for the disease.
$9.$ You should really see the doctor
- S + should + V (Bare).