Some tax-exempt organisations are allowed to conduct political activities, but it cannot be their primary mission.
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"There's an old saying that charity begins at home, but it cannot end there, " Rock said.
It may be diligent, but it cannot be transparent, which is what people now want.
But it cannot bodge everything, so it must also have a small amount of other nutrients.
Your message might be deep and compelling, but it cannot annoy and turn off your prospects.
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Class matters in politics - it can cut both ways, but it cannot be ignored.
But it cannot be right that people coming to fill short-term skills gaps can stay long-term.
Syria will put pressure on the guerrillas to pipe down, but it cannot silence them altogether.
Added pressure from America might speed up negotiations, but it cannot guarantee the outcome.
Falling fertility may be making poor people's lives better, but it cannot save the Earth.
They may move their limbs and eyes, but it cannot be done to command.
It can be an incredibly powerful tool but it cannot work alone or in a silo.
But it cannot remove them altogether, because the continent's population will continue to grow, albeit more slowly.
The new iPad can indeed connect with 4G networks in some places but it cannot in others.
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Open immigration will help to address economic, social and fiscal issues, but it cannot solve them by itself.
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As Tom Ridge, America's homeland-security chief, has said, the threat can be reduced, but it cannot be eliminated.
Football has been played there since 1894 but it cannot be developed further because of a preservation order.
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This change could, he reckons, affect a gravimeter, but it cannot account for the results from the pendulums.
It explains extremely well the world around us, but it cannot explain the way most of the Universe behaves.
But it cannot say so too loudly without risking its prized reputation of being frugal with the public finances.
He knows that compromise requires tough decisions by both sides, but it cannot require compromise by one side only.
It can point out flaws in proposed laws, but it cannot block them.
But it cannot be applied to countries without any European connections, and there is nothing much else in the toolbox.
As for help from abroad, the IMF can give instructions to individual countries, but it cannot run the whole region.
There is no doubt that banking does need a degree of reform, but it cannot be by setting unrealistic lending targets.
Newly issued yuan can keep workers on the payroll for another month, but it cannot make a fundamentally sick company productive.
But it cannot be loosened until the government has shown the markets it is acting firmly against the fiscal and balance-of-payments deficits.
LinkedIn has grown rapidly over the past couple of years, but it cannot be expected to maintain the same pace going forward.
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But it cannot vouch for the rest working in the private sector.
The industry may be secretive but it cannot generally hide high-profile disasters.
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