Verbo irregolare: freeze - froze - frozen
Forma semplice | Forma con V-ing |
- - it must freeze - - - | - - it must be freezing - - - |
Perfetto | Perfetto con V-ing |
- - it must have frozen - - - | - - it must have been freezing - - - |
Forma semplice | Forma con V-ing |
- - it mustn't freeze - - - | - - it mustn't be freezing - - - |
Perfetto | Perfetto con V-ing |
- - it mustn't have frozen - - - | - - it mustn't have been freezing - - - |
Forma semplice | Forma con V-ing |
- - must it freeze? - - - | - - must it be freezing? - - - |
Perfetto | Perfetto con V-ing |
- - must it have frozen? - - - | - - must it have been freezing? - - - |
Forma semplice | Forma con V-ing |
- - mustn't it freeze? - - - | - - mustn't it be freezing? - - - |
Perfetto | Perfetto con V-ing |
- - mustn't it have frozen? - - - | - - mustn't it have been freezing? - - - |