
Verbe régulier : sightsee - sightseed - sightseed
Forme simple | Forme en V-ing | 
| I must sightsee you must sightsee she must sightsee we must sightsee you must sightsee they must sightsee  | I must be sightseeing you must be sightseeing she must be sightseeing we must be sightseeing you must be sightseeing they must be sightseeing  | 
Perfect | Perfect en V-ing | 
| I must have sightseed you must have sightseed she must have sightseed we must have sightseed you must have sightseed they must have sightseed  | I must have been sightseeing you must have been sightseeing she must have been sightseeing we must have been sightseeing you must have been sightseeing they must have been sightseeing  | 
Forme simple | Forme en V-ing | 
| I mustn't sightsee you mustn't sightsee she mustn't sightsee we mustn't sightsee you mustn't sightsee they mustn't sightsee  | I mustn't be sightseeing you mustn't be sightseeing she mustn't be sightseeing we mustn't be sightseeing you mustn't be sightseeing they mustn't be sightseeing  | 
Perfect | Perfect en V-ing | 
| I mustn't have sightseed you mustn't have sightseed she mustn't have sightseed we mustn't have sightseed you mustn't have sightseed they mustn't have sightseed  | I mustn't have been sightseeing you mustn't have been sightseeing she mustn't have been sightseeing we mustn't have been sightseeing you mustn't have been sightseeing they mustn't have been sightseeing  | 
Forme simple | Forme en V-ing | 
| must I sightsee? must you sightsee? must she sightsee? must we sightsee? must you sightsee? must they sightsee?  | must I be sightseeing? must you be sightseeing? must she be sightseeing? must we be sightseeing? must you be sightseeing? must they be sightseeing?  | 
Perfect | Perfect en V-ing | 
| must I have sightseed? must you have sightseed? must she have sightseed? must we have sightseed? must you have sightseed? must they have sightseed?  | must I have been sightseeing? must you have been sightseeing? must she have been sightseeing? must we have been sightseeing? must you have been sightseeing? must they have been sightseeing?  | 
Forme simple | Forme en V-ing | 
| mustn't I sightsee? mustn't you sightsee? mustn't she sightsee? mustn't we sightsee? mustn't you sightsee? mustn't they sightsee?  | mustn't I be sightseeing? mustn't you be sightseeing? mustn't she be sightseeing? mustn't we be sightseeing? mustn't you be sightseeing? mustn't they be sightseeing?  | 
Perfect | Perfect en V-ing | 
| mustn't I have sightseed? mustn't you have sightseed? mustn't she have sightseed? mustn't we have sightseed? mustn't you have sightseed? mustn't they have sightseed?  | mustn't I have been sightseeing? mustn't you have been sightseeing? mustn't she have been sightseeing? mustn't we have been sightseeing? mustn't you have been sightseeing? mustn't they have been sightseeing?  |