Usa "to be proof" in una frase

1. He was supposed to be proof against this type of manipulation, and generally he was

2. the ones I experienced on this date in 1969 to be proof that we inner souls do live on when the body

3. the literal view, but it is desperately needed for this not to be a parable for it to be proof

4. their literal view, but they DESPERATELY NEED this to be a parable for it to be proof