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