
Verbe irrégulier : begin - began - begun
Traduction française : commencer 
Forme simple | Forme en V-ing | 
| I must begin you must begin she must begin we must begin you must begin they must begin  | I must be beginning you must be beginning she must be beginning we must be beginning you must be beginning they must be beginning  | 
Perfect | Perfect en V-ing | 
| I must have begun you must have begun she must have begun we must have begun you must have begun they must have begun  | I must have been beginning you must have been beginning she must have been beginning we must have been beginning you must have been beginning they must have been beginning  | 
Forme simple | Forme en V-ing | 
| I mustn't begin you mustn't begin she mustn't begin we mustn't begin you mustn't begin they mustn't begin  | I mustn't be beginning you mustn't be beginning she mustn't be beginning we mustn't be beginning you mustn't be beginning they mustn't be beginning  | 
Perfect | Perfect en V-ing | 
| I mustn't have begun you mustn't have begun she mustn't have begun we mustn't have begun you mustn't have begun they mustn't have begun  | I mustn't have been beginning you mustn't have been beginning she mustn't have been beginning we mustn't have been beginning you mustn't have been beginning they mustn't have been beginning  | 
Forme simple | Forme en V-ing | 
| must I begin? must you begin? must she begin? must we begin? must you begin? must they begin?  | must I be beginning? must you be beginning? must she be beginning? must we be beginning? must you be beginning? must they be beginning?  | 
Perfect | Perfect en V-ing | 
| must I have begun? must you have begun? must she have begun? must we have begun? must you have begun? must they have begun?  | must I have been beginning? must you have been beginning? must she have been beginning? must we have been beginning? must you have been beginning? must they have been beginning?  | 
Forme simple | Forme en V-ing | 
| mustn't I begin? mustn't you begin? mustn't she begin? mustn't we begin? mustn't you begin? mustn't they begin?  | mustn't I be beginning? mustn't you be beginning? mustn't she be beginning? mustn't we be beginning? mustn't you be beginning? mustn't they be beginning?  | 
Perfect | Perfect en V-ing | 
| mustn't I have begun? mustn't you have begun? mustn't she have begun? mustn't we have begun? mustn't you have begun? mustn't they have begun?  | mustn't I have been beginning? mustn't you have been beginning? mustn't she have been beginning? mustn't we have been beginning? mustn't you have been beginning? mustn't they have been beginning?  |