You should/shouldn't touch the hot hob.
should
What's the matter?
cough
What's this?
cast
What's the matter?
toothache
What's the matter?
cut
What's the matter?
sore throat
What's this?
matches
What's the matter?
stomachache
You should/shouldn't be careful with a fireplace.
should
What's this?
plaster
What's the matter?
fever
What's this?
stairs
What's the matter?
burn
What's the matter?
earache
What's this?
socket
What's the matter?
headache
You should/shouldn't play with the knives.
shouldn't
What's this?
oven