careful
(adjective)
careful + of + noun
Be careful of that man.
careful + with + noun
Be careful with the knife.
careful + about + noun
Be careful about the things you say.
careful + about + noun clause
Be careful about what you eat.
careful + about + -ing form
Be careful about discussing that issue.
careful + to + base form
Be careful to look both ways when you cross the road.
careful + not + to + base form
Be careful not to disturb your father.