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