Help the gloomy ghost express his afterlife regrets to the local paranormal investigator. Choose the appropriate verb forms to complete his complaints.

I wish I had chosen to haunt a spooky medieval castle instead of a boring accounting firm.

If only I hadn't scared away the only employee who knew how to make good coffee!

I wish I had chosen to haunt a spooky medieval castle instead of a boring accounting firm.

To talk about regrets regarding past decisions, we use "wish" followed by the past perfect (had chosen).

If only I hadn't scared away the only employee who knew how to make good coffee!

"If only" follows the same rule as "wish" for past regrets. Since the ghost regrets an action he actually did (scaring the employee), he uses the negative past perfect (hadn't scared) to imagine the opposite scenario.