She seems single?

[BobK]

He proved (to be) a good husband. (No, you can't say "He proved a good husband" -- that is a nonsense sentence)

Smile when you say that - it's fine in Br English.

b

[Allen165]

NOT A TEACHER.

I also agree that "He proved a good husband" is good English. I would argue that using "prove" without "to be" gives the sentence a more literary sound.