Answer the following question about this sentence:

I hung up the phone.

What is the cause?
Ans: **The caller said goodbye to me.**

Answer the following question about this sentence:

The man grieved.

What is the cause?
Ans: **His mother passed away.**

Answer the following question about this sentence:

The man was bitten by mosquitoes.

What is the cause?
Ans:
**He went camping in the woods.**