Question: The girl's mouth ached. What is the cause?

Answer: She lost a tooth.

Question: I learned how to play the board game. What is the cause?

Answer: My friend explained the rules to me.

Question: The girl desired her parent's approval. What is the effect?

Answer: She obeyed her parent's rules.

Question: The man took a shower. What is the cause?

Answer:
He was sweaty from working out.