Regular verb: snow - snowed - snowed
Simple form | V-ing form |
- - it could snow - - - | - - it could be snowing - - - |
Perfect | V-ing perfect |
- - it could have snowed - - - | - - it could have been snowing - - - |
Simple form | V-ing form |
- - it could not snow - - - | - - it could not be snowing - - - |
Perfect | V-ing perfect |
- - it could not have snowed - - - | - - it could not have been snowing - - - |
Simple form | V-ing form |
- - could it snow? - - - | - - could it be snowing? - - - |
Perfect | V-ing perfect |
- - could it have snowed? - - - | - - could it have been snowing? - - - |
Simple form | V-ing form |
- - could it not snow? - - - | - - could it not be snowing? - - - |
Perfect | V-ing perfect |
- - could it not have snowed? - - - | - - could it not have been snowing? - - - |