
Verbo regolare: snow - snowed - snowed
Forma semplice | Forma con V-ing | 
| - - it ought to snow - - -  | - - it ought to be snowing - - -  | 
Perfetto | Perfetto con V-ing | 
| - - it ought to have snowed - - -  | - - it ought to have been snowing - - -  | 
Forma semplice | Forma con V-ing | 
| - - it ought not to snow - - -  | - - it ought not to snowing - - -  | 
Perfetto | Perfetto con V-ing | 
| - - it ought not to have snowed - - -  | - - it ought not to have been snowing - - -  | 
Forma semplice | Forma con V-ing | 
| - - ought to it snow? - - -  | - - ought to it be snowing? - - -  | 
Perfetto | Perfetto con V-ing | 
| - - ought to it have snowed? - - -  | - - ought to it have been snowing? - - -  | 
Forma semplice | Forma con V-ing | 
| - - ought it not to snow? - - -  | - - ought it not to be snowing? - - -  | 
Perfetto | Perfetto con V-ing | 
| - - ought it not to have snowed? - - -  | - - ought it not to have been snowing? - - -  |