
Verbo regular: found - founded - founded
Forma simple | Forma con V-ing | 
| I must found you must found she must found we must found you must found they must found  | I must be founding you must be founding she must be founding we must be founding you must be founding they must be founding  | 
Perfecto | Perfecto con V-ing | 
| I must have founded you must have founded she must have founded we must have founded you must have founded they must have founded  | I must have been founding you must have been founding she must have been founding we must have been founding you must have been founding they must have been founding  | 
Forma simple | Forma con V-ing | 
| I mustn't found you mustn't found she mustn't found we mustn't found you mustn't found they mustn't found  | I mustn't be founding you mustn't be founding she mustn't be founding we mustn't be founding you mustn't be founding they mustn't be founding  | 
Perfecto | Perfecto con V-ing | 
| I mustn't have founded you mustn't have founded she mustn't have founded we mustn't have founded you mustn't have founded they mustn't have founded  | I mustn't have been founding you mustn't have been founding she mustn't have been founding we mustn't have been founding you mustn't have been founding they mustn't have been founding  | 
Forma simple | Forma con V-ing | 
| must I found? must you found? must she found? must we found? must you found? must they found?  | must I be founding? must you be founding? must she be founding? must we be founding? must you be founding? must they be founding?  | 
Perfecto | Perfecto con V-ing | 
| must I have founded? must you have founded? must she have founded? must we have founded? must you have founded? must they have founded?  | must I have been founding? must you have been founding? must she have been founding? must we have been founding? must you have been founding? must they have been founding?  | 
Forma simple | Forma con V-ing | 
| mustn't I found? mustn't you found? mustn't she found? mustn't we found? mustn't you found? mustn't they found?  | mustn't I be founding? mustn't you be founding? mustn't she be founding? mustn't we be founding? mustn't you be founding? mustn't they be founding?  | 
Perfecto | Perfecto con V-ing | 
| mustn't I have founded? mustn't you have founded? mustn't she have founded? mustn't we have founded? mustn't you have founded? mustn't they have founded?  | mustn't I have been founding? mustn't you have been founding? mustn't she have been founding? mustn't we have been founding? mustn't you have been founding? mustn't they have been founding?  |