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Which sentence do you find more natural?

Your last actions only prove me that you're not worth my trust.

Your last actions only prove to me that you're not worth my trust.

or maybe some other form like

Your last actions only confirm (my belief / me in the belief) that you're not worth my trust.


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up vote 3 down vote accepted

The second sentence, 'prove to me', is more natural (and indeed correct where the first one is not). Prove is a verb so needs the to.

The 'confirm my belief' (me in the belief isn't quite right) sentence is a bit formal.

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The last form would be good for emphasis, IMO. – ijw Jan 31 '11 at 13:28
It's nothing to do with whether "prove" is a verb. See Hellion's answer. – Colin Fine Jan 31 '11 at 18:37

The verb prove is never used with an indirect object, only a prepositional object.

You can use indirect object with verbs of communication and and giving, such as

He asked me a question. She gave me a dirty look.

But you would never say

He proved me an equation. She proved the company her value.

The correct form for that is always "proved (direct object) to (prepositional object)", as in

He proved an equation to me. She proved her value to the company.

The only case where you would find a personal noun or pronoun directly after "proved" is when you are using that personal reference as a shortcut to mean something that this person has said (and therefore they are the direct object of proved):

Prove me wrong, if you can.
The course of events proved him correct.

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Re the last point: no it's not necessarily about what the person said. It is "Prove [a person] [a description]" meaning "Prove that [the person] is [description]". So "Prove me a liar!" "This proved him unfit for office". The description is generally a negative one. – Colin Fine Jan 31 '11 at 18:41

My preference goes to

Your last actions only confirm (my belief / me in the belief) that you're not worth my trust.

but "prove to me" would also be correct.

Note: I suspect you mean "worthy of my trust" rather than "worth of my trust". (worthy = deserving, worth = important/valuable enough)

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