
Verbe régulier : mar -  marred - marred
Traduction française : gâter - gâcher 
Forme simple | Forme en V-ing | 
| I must mar you must mar she must mar we must mar you must mar they must mar  | I must be marring you must be marring she must be marring we must be marring you must be marring they must be marring  | 
Perfect | Perfect en V-ing | 
| I must have marred you must have marred she must have marred we must have marred you must have marred they must have marred  | I must have been marring you must have been marring she must have been marring we must have been marring you must have been marring they must have been marring  | 
Forme simple | Forme en V-ing | 
| I mustn't mar you mustn't mar she mustn't mar we mustn't mar you mustn't mar they mustn't mar  | I mustn't be marring you mustn't be marring she mustn't be marring we mustn't be marring you mustn't be marring they mustn't be marring  | 
Perfect | Perfect en V-ing | 
| I mustn't have marred you mustn't have marred she mustn't have marred we mustn't have marred you mustn't have marred they mustn't have marred  | I mustn't have been marring you mustn't have been marring she mustn't have been marring we mustn't have been marring you mustn't have been marring they mustn't have been marring  | 
Forme simple | Forme en V-ing | 
| must I mar? must you mar? must she mar? must we mar? must you mar? must they mar?  | must I be marring? must you be marring? must she be marring? must we be marring? must you be marring? must they be marring?  | 
Perfect | Perfect en V-ing | 
| must I have marred? must you have marred? must she have marred? must we have marred? must you have marred? must they have marred?  | must I have been marring? must you have been marring? must she have been marring? must we have been marring? must you have been marring? must they have been marring?  | 
Forme simple | Forme en V-ing | 
| mustn't I mar? mustn't you mar? mustn't she mar? mustn't we mar? mustn't you mar? mustn't they mar?  | mustn't I be marring? mustn't you be marring? mustn't she be marring? mustn't we be marring? mustn't you be marring? mustn't they be marring?  | 
Perfect | Perfect en V-ing | 
| mustn't I have marred? mustn't you have marred? mustn't she have marred? mustn't we have marred? mustn't you have marred? mustn't they have marred?  | mustn't I have been marring? mustn't you have been marring? mustn't she have been marring? mustn't we have been marring? mustn't you have been marring? mustn't they have been marring?  |