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Help the melodramatic actor finish his theatrical farewell letter to his director.
"I regret _________________________ you that I am quitting the play immediately.
Furthermore, I deeply regret _________________________ the role of the Giant Chicken in the first place!"
to inform
We use regret + to infinitive (usually with verbs like say, tell, inform) as a formal, polite way to deliver bad news.
accepting
We use regret + -ing to express sorrow or remorse about something that we did in the past. The actor wishes he hadn't taken the silly role!