You're right. Thanks. I was having trouble thinking of a situation where that was a positive thing.
what about "he assured that she had not eaten." We use "had" in places Spanish might not.
Spanish has that phrasing as well, and it's a little different. "she had not eaten" would be "no ha comido" in Spanish.
you don't usuually guarantee that someone doesn't eat ... he made sure that she didn't eat is a much more likely expression