I was here before, and you proved too tough for me to break.

He may prove tougher than both of us put together.

The process is proving much tougher than the Government had expected.

Next year could prove even tougher, politically, for the company.

But future trade issues will probably prove much tougher to crack.

But coming to any final agreement with its partners has proven tough.

But the revenue side proved tough last year for Toyota.

But Williams, who finished with 30 points and 10 assists, proved too tough.

But this tiny town of around 2,000 proved tough to tame.