It is certainly allowed but it has not happened in the 281 Tests I have scored.
But it has not been anything like a classical El Nino pattern up until now.
Milosevic's end has been predicted many times of late, but it has not happened.
But it has not come to an end yet because there is an ongoing process.
The proposed closedown of Guantanamo Bay has been announced but it has not happened.
The assault may have worked in South Carolina, but it has not helped Mr Bush since.
The common ground between the two parties has shrunk, but it has not quite disappeared.
But it has not yet proved that it could do a better job than Vienna.
The Republican party is a coalition, but it has not divided into hostile camps.
It is not all that frequent, but it has not been less frequent in recent years.
But it has not toppled them, and as things stand it seems to be fading.
All this may seem obvious, but it has not saved Americans from nostalgia yet.
The stimulus plan has protected public-sector employees from layoffs, but it has not sparked private-sector job creation.
In May 2011 Fatah and Hamas signed a reconciliation deal but it has not yet been implemented.
They've picked the most benign looking spot, but it has not turned out to be very benign.
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Its net losses have lessened each consecutive year since then, but it has not returned to a profit.
The Cyberport is indeed a nice collection of buildings but it has not spurred many successful high-tech start-ups.
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In May 2011 the two Palestinian factions signed a reconciliation deal but it has not yet been implemented.
But it has not yet engaged in anything akin to the radical self-flagellation that goes on daily at Patagonia.
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But it has not allowed American combat troops to operate on its territory.
But it has not demanded an equity stake in the notionally private-sector project.
The private-equity industry may be regaining some of its bravado but it has not gone back to its glory days.
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But it has not yet decided what action to take against the four Verizon customers it accuses of illegal file-sharing.
In November, the U.S. government introduced air cargo security legislation, but it has not yet been brought up for vote.
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Replacing outmoded radar-based air traffic control with more efficient systems has been possible for decades, but it has not happened.
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The price varies slightly from year to year, but it has not been showing an upward trend in recent years.
You would think that QE2, which comes to an end on June 30, would have helped, but it has not.
This is Mr Bernanke's preferred cure, but it has not stopped deflation in Japan, where long-term bond yields are 0.6%.
But it has not been growing as robustly as it needs to in order to put people back to work.
But it has not yet even published its terms of reference, and wants to abolish the hereditaries before it reports.
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