
Verbo regular: snow - snowed - snowed
Forma simple | Forma con V-ing | 
| - - it can snow - - -  | - - it can be snowing - - -  | 
Perfecto | Perfecto con V-ing | 
| - - it can have snowed - - -  | - - it can have been snowing - - -  | 
Forma simple | Forma con V-ing | 
| - - it cannot snow - - -  | - - it cannot be snowing - - -  | 
Perfecto | Perfecto con V-ing | 
| - - it cannot have snowed - - -  | - - it cannot have been snowing - - -  | 
Forma simple | Forma con V-ing | 
| - - can it snow? - - -  | - - can it be snowing? - - -  | 
Perfecto | Perfecto con V-ing | 
| - - can it have snowed? - - -  | - - can it have been snowing? - - -  | 
Forma simple | Forma con V-ing | 
| - - can it not snow? - - -  | - - can it not be snowing? - - -  | 
Perfecto | Perfecto con V-ing | 
| - - can it not have snowed? - - -  | - - can it not have been snowing? - - -  |