Sentence examples for hard to prove from inspiring English sources

Also hard to prove.

"It's hard to prove".

Hard to prove definitively.

Granted, that proposition is hard to prove.

It is also hard to prove.

It was hard to prove her wrong.

That charge is hard to prove.

His contention is hard to prove.

But attribution is hard to prove.

This makes it especially hard to prove.

But this is hard to prove.