You shouldn't -
play with matches.
Why shouldn't you play with matches?
Because you can burn yourself.
You shouldn't -
play with the knife.
Why shouldn't you play with the knife?
Because you can cut yourself.
You shouldn't -
climb trees.
Why shouldn't you climb trees?
Because you can fall out and break your arm/leg.
You shouldn't -
run down stairs.
Why shouldn't you run dowstairs?
Because you can fall down and break your arm/leg.
You shouldn't -
ride your bike too fast.
Why shouldn't you ride your bike too fast?
Because you can fall off and break your arm/leg.
You shouldn't -
play with the stove.
Why shouldn't you play with the stove?
Because you can burn yourself.
What's the matter with you?
I have a headache.
What's the matter with you?
I have a toothache.
What's the matter with him?
He has a cough.
What's the matter with him?
He has a backache.
