
Irregular verb: refit - refit - refit
Simple form | V-ing form | 
| I must refit you must refit he must refit we must refit you must refit they must refit  | I must be refitting you must be refitting he must be refitting we must be refitting you must be refitting they must be refitting  | 
Perfect | V-ing perfect | 
| I must have refit you must have refit he must have refit we must have refit you must have refit they must have refit  | I must have been refitting you must have been refitting he must have been refitting we must have been refitting you must have been refitting they must have been refitting  | 
Simple form | V-ing form | 
| I mustn't refit you mustn't refit he mustn't refit we mustn't refit you mustn't refit they mustn't refit  | I mustn't be refitting you mustn't be refitting he mustn't be refitting we mustn't be refitting you mustn't be refitting they mustn't be refitting  | 
Perfect | V-ing perfect | 
| I mustn't have refit you mustn't have refit he mustn't have refit we mustn't have refit you mustn't have refit they mustn't have refit  | I mustn't have been refitting you mustn't have been refitting he mustn't have been refitting we mustn't have been refitting you mustn't have been refitting they mustn't have been refitting  | 
Simple form | V-ing form | 
| must I refit? must you refit? must he refit? must we refit? must you refit? must they refit?  | must I be refitting? must you be refitting? must he be refitting? must we be refitting? must you be refitting? must they be refitting?  | 
Perfect | V-ing perfect | 
| must I have refit? must you have refit? must he have refit? must we have refit? must you have refit? must they have refit?  | must I have been refitting? must you have been refitting? must he have been refitting? must we have been refitting? must you have been refitting? must they have been refitting?  | 
Simple form | V-ing form | 
| mustn't I refit? mustn't you refit? mustn't he refit? mustn't we refit? mustn't you refit? mustn't they refit?  | mustn't I be refitting? mustn't you be refitting? mustn't he be refitting? mustn't we be refitting? mustn't you be refitting? mustn't they be refitting?  | 
Perfect | V-ing perfect | 
| mustn't I have refit? mustn't you have refit? mustn't he have refit? mustn't we have refit? mustn't you have refit? mustn't they have refit?  | mustn't I have been refitting? mustn't you have been refitting? mustn't he have been refitting? mustn't we have been refitting? mustn't you have been refitting? mustn't they have been refitting?  |