
Verbo regular: impress - impressed - impressed
Forma simple | Forma con V-ing | 
| I must impress you must impress he must impress we must impress you must impress they must impress  | I must be impressing you must be impressing he must be impressing we must be impressing you must be impressing they must be impressing  | 
Perfecto | Perfecto con V-ing | 
| I must have impressed you must have impressed he must have impressed we must have impressed you must have impressed they must have impressed  | I must have been impressing you must have been impressing he must have been impressing we must have been impressing you must have been impressing they must have been impressing  | 
Forma simple | Forma con V-ing | 
| I mustn't impress you mustn't impress he mustn't impress we mustn't impress you mustn't impress they mustn't impress  | I mustn't be impressing you mustn't be impressing he mustn't be impressing we mustn't be impressing you mustn't be impressing they mustn't be impressing  | 
Perfecto | Perfecto con V-ing | 
| I mustn't have impressed you mustn't have impressed he mustn't have impressed we mustn't have impressed you mustn't have impressed they mustn't have impressed  | I mustn't have been impressing you mustn't have been impressing he mustn't have been impressing we mustn't have been impressing you mustn't have been impressing they mustn't have been impressing  | 
Forma simple | Forma con V-ing | 
| must I impress? must you impress? must he impress? must we impress? must you impress? must they impress?  | must I be impressing? must you be impressing? must he be impressing? must we be impressing? must you be impressing? must they be impressing?  | 
Perfecto | Perfecto con V-ing | 
| must I have impressed? must you have impressed? must he have impressed? must we have impressed? must you have impressed? must they have impressed?  | must I have been impressing? must you have been impressing? must he have been impressing? must we have been impressing? must you have been impressing? must they have been impressing?  | 
Forma simple | Forma con V-ing | 
| mustn't I impress? mustn't you impress? mustn't he impress? mustn't we impress? mustn't you impress? mustn't they impress?  | mustn't I be impressing? mustn't you be impressing? mustn't he be impressing? mustn't we be impressing? mustn't you be impressing? mustn't they be impressing?  | 
Perfecto | Perfecto con V-ing | 
| mustn't I have impressed? mustn't you have impressed? mustn't he have impressed? mustn't we have impressed? mustn't you have impressed? mustn't they have impressed?  | mustn't I have been impressing? mustn't you have been impressing? mustn't he have been impressing? mustn't we have been impressing? mustn't you have been impressing? mustn't they have been impressing?  |