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