
Verbe régulier : happen -  happened - happened
Traduction française : arriver - se passer 
| Forme simple | Forme en V-ing | 
| - - it may happen - - - | - - it may be happening - - - | 
| Perfect | Perfect en V-ing | 
| - - it may have happened - - - | - - it may have been happening - - - | 
| Forme simple | Forme en V-ing | 
| - - it may not happen - - - | - - it may not be happening - - - | 
| Perfect | Perfect en V-ing | 
| - - it may not have happened - - - | - - it may not have been happening - - - | 
| Forme simple | Forme en V-ing | 
| - - may it happen? - - - | - - may it be happening? - - - | 
| Perfect | Perfect en V-ing | 
| - - may it have happened? - - - | - - may it have been happening? - - - | 
| Forme simple | Forme en V-ing | 
| - - may it not happen? - - - | - - may it not be happening? - - - | 
| Perfect | Perfect en V-ing | 
| - - may it not have happened? - - - | - - may it not have been happening? - - - |