
Verbo regular: gab - gabbed - gabbed
Forma simple | Forma con V-ing | 
| I must gab you must gab she must gab we must gab you must gab they must gab  | I must be gabbing you must be gabbing she must be gabbing we must be gabbing you must be gabbing they must be gabbing  | 
Perfecto | Perfecto con V-ing | 
| I must have gabbed you must have gabbed she must have gabbed we must have gabbed you must have gabbed they must have gabbed  | I must have been gabbing you must have been gabbing she must have been gabbing we must have been gabbing you must have been gabbing they must have been gabbing  | 
Forma simple | Forma con V-ing | 
| I mustn't gab you mustn't gab she mustn't gab we mustn't gab you mustn't gab they mustn't gab  | I mustn't be gabbing you mustn't be gabbing she mustn't be gabbing we mustn't be gabbing you mustn't be gabbing they mustn't be gabbing  | 
Perfecto | Perfecto con V-ing | 
| I mustn't have gabbed you mustn't have gabbed she mustn't have gabbed we mustn't have gabbed you mustn't have gabbed they mustn't have gabbed  | I mustn't have been gabbing you mustn't have been gabbing she mustn't have been gabbing we mustn't have been gabbing you mustn't have been gabbing they mustn't have been gabbing  | 
Forma simple | Forma con V-ing | 
| must I gab? must you gab? must she gab? must we gab? must you gab? must they gab?  | must I be gabbing? must you be gabbing? must she be gabbing? must we be gabbing? must you be gabbing? must they be gabbing?  | 
Perfecto | Perfecto con V-ing | 
| must I have gabbed? must you have gabbed? must she have gabbed? must we have gabbed? must you have gabbed? must they have gabbed?  | must I have been gabbing? must you have been gabbing? must she have been gabbing? must we have been gabbing? must you have been gabbing? must they have been gabbing?  | 
Forma simple | Forma con V-ing | 
| mustn't I gab? mustn't you gab? mustn't she gab? mustn't we gab? mustn't you gab? mustn't they gab?  | mustn't I be gabbing? mustn't you be gabbing? mustn't she be gabbing? mustn't we be gabbing? mustn't you be gabbing? mustn't they be gabbing?  | 
Perfecto | Perfecto con V-ing | 
| mustn't I have gabbed? mustn't you have gabbed? mustn't she have gabbed? mustn't we have gabbed? mustn't you have gabbed? mustn't they have gabbed?  | mustn't I have been gabbing? mustn't you have been gabbing? mustn't she have been gabbing? mustn't we have been gabbing? mustn't you have been gabbing? mustn't they have been gabbing?  |