
Verbo regular: differ - differed - differed
Forma simple | Forma con V-ing | 
| I must differ you must differ he must differ we must differ you must differ they must differ  | I must be differing you must be differing he must be differing we must be differing you must be differing they must be differing  | 
Perfecto | Perfecto con V-ing | 
| I must have differed you must have differed he must have differed we must have differed you must have differed they must have differed  | I must have been differing you must have been differing he must have been differing we must have been differing you must have been differing they must have been differing  | 
Forma simple | Forma con V-ing | 
| I mustn't differ you mustn't differ he mustn't differ we mustn't differ you mustn't differ they mustn't differ  | I mustn't be differing you mustn't be differing he mustn't be differing we mustn't be differing you mustn't be differing they mustn't be differing  | 
Perfecto | Perfecto con V-ing | 
| I mustn't have differed you mustn't have differed he mustn't have differed we mustn't have differed you mustn't have differed they mustn't have differed  | I mustn't have been differing you mustn't have been differing he mustn't have been differing we mustn't have been differing you mustn't have been differing they mustn't have been differing  | 
Forma simple | Forma con V-ing | 
| must I differ? must you differ? must he differ? must we differ? must you differ? must they differ?  | must I be differing? must you be differing? must he be differing? must we be differing? must you be differing? must they be differing?  | 
Perfecto | Perfecto con V-ing | 
| must I have differed? must you have differed? must he have differed? must we have differed? must you have differed? must they have differed?  | must I have been differing? must you have been differing? must he have been differing? must we have been differing? must you have been differing? must they have been differing?  | 
Forma simple | Forma con V-ing | 
| mustn't I differ? mustn't you differ? mustn't he differ? mustn't we differ? mustn't you differ? mustn't they differ?  | mustn't I be differing? mustn't you be differing? mustn't he be differing? mustn't we be differing? mustn't you be differing? mustn't they be differing?  | 
Perfecto | Perfecto con V-ing | 
| mustn't I have differed? mustn't you have differed? mustn't he have differed? mustn't we have differed? mustn't you have differed? mustn't they have differed?  | mustn't I have been differing? mustn't you have been differing? mustn't he have been differing? mustn't we have been differing? mustn't you have been differing? mustn't they have been differing?  |