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