11.   This made me remember what had happened before and ever since I have been treating both water and canoes with a good degree of caution and respect.

12.   Also, nothing has happened this week that marks a significant change from what was happening before the terrorist attacks.

13.   Although death row breakouts are rare, they have happened before.

14.   And the lawsuit states that the situation could have been avoided, and that policies should have been in place because similar mistakes have happened before.

15.   And no amount of theorizing is apt to converge on a persuasive explanation of where the mathematical laws are written or what happened before the Big Bang.

16.   And to think it happened right before our eyes.

17.   And the modest slippage could have happened even before the Whitewater verdicts, because that particular question had not been asked since last August.

18.   And what happens with these bills, particularly the one before Congress, may determine the political health of the Democrats and the Republicans after the November election.

19.   Andruw Jones is having a wretched spring, which has happened before.

20.   Back then, Fox boasted that real changes on the immigration front would happen before the end of this year.