Proven is an adjective only.
"Proven to be" is corrupted mumbo jumbo.
"Proved to be" would be correct usage.
Example: Dale's mastery of the English language proved to be valuable.
Example: Dale's proven mastery of the English language was valuable.
More to the point, "proven" can be used interchangeably with the word "known" ... as in Mercedes is a car of proven quality. Sorry, "proven" is no more a verb than is fast, quick or easy. It's not an important distinction in everyday life, but to declare wrong is right, well, is wrong.
From one gun owner to another, happy shooting.
Well crap.. I looked it up in the grammar checker... and dang it.. you're right.
Dang.
Crow tastes nasty. Need BBQ sauce.
(edit) Now I'm confused.. I knew I was taught this as a past participle in school.. so I looked further.
Apparently it depends on which grammar site you read. One says proven is an adjective... another says IF you use it as an adjective use proven.. .but they are interchangeable.
Quote 1
Quote 2Understand that both of these words are noted by some dictionaries as past participles of "prove." Professional writers take a more particular view of the use of these words. If you aren't going to lose your job over it, use whichever word sounds and works the best for you. But be sure to use "proven" for the adjectives. Example: "The proven method."
2
Know that "proved" is the current choice for the past participle of the verb "prove." An example: The professor has proved his strengths in mathematics.
3
Use "proven" as an adjective in journalism always. "Proven" is not used as a past participle in journalism.
4
Apply the rules for predicate adjective in a linking verb construction as well by using "proven." Use "proven" as an adjective that modifies another word as in the following example: The professor's ability is proven. "Proven" modifies "ability;" it is not a part of the verb.
Read more: How to Use Proved and Proven Correctly | eHow.com How to Use Proved and Proven Correctly | eHow.com
Both “proved” and “proven” are past participles of “prove.” And both are considered proper: “proved” being the original past tense and “proven” being of a more recent vintage.
The hypothesis was proved incorrect.
The hypothesis was proven incorrect.
Both are correct. “Proven” is more commonly used in the US, and “proved” is more often used in the UK. When used as an adjective (when modifying a noun), “proven” is the correct form to use.
We use a proven formula in our model.
Weekly Language Usage Tips: Proved/proven, compared to/with « Language Usage Weblog
Could we BOTH be right? LOL.
Dale