1. John is certain to please Mary.<br/><br/>2. It is certain that John pleases Mary.<br/><br/>3. John appears to please Mary.<br/><br/>4. It appears that John pleases Mary.<br/><br/>#1 and #3 can be rephrased to #2 and 4 respectively.<br/><br/>5. It happend to snow.<br/><br/>6. It turned out to be false.<br/><br/>I wonder if #5 and 6 can be rephrased.