It certainly did not challenge him.
The Cameron plan involved "rule changes" certainly, but it did not challenge the core principles of the EU as contained in the treaties.
"We certainly don't challenge people now".
"But he felt it was time, and I certainly wouldn't challenge him on that".
"I certainly won't challenge Senator Trunzo on his age," he said.
And it certainly won't challenge the power of the internet's biggest companies.
"But I certainly don't challenge anyone's right to run, particularly having started my own political life running against an incumbent".
They don't spend the best part of two decades providing one of the hardest opposition match-ups in football and they certainly don't challenge the prejudices and hypocrisies of an entire nation with the dignity that Goodes has.
I haven't read Carr's book (or the 2008 article in the Atlantic Monthly from which it arose), and certainly can't challenge the neuroscience that, according to Miller, he cites.
Yoga Hosers will certainly not be challenging any box office records this weekend, but that doesn't seem to be the point.
