Regular verb: undertain - undertained - undertained
Simple form | V-ing form |
I must undertain you must undertain he must undertain we must undertain you must undertain they must undertain | I must be undertaining you must be undertaining he must be undertaining we must be undertaining you must be undertaining they must be undertaining |
Perfect | V-ing perfect |
I must have undertained you must have undertained he must have undertained we must have undertained you must have undertained they must have undertained | I must have been undertaining you must have been undertaining he must have been undertaining we must have been undertaining you must have been undertaining they must have been undertaining |
Simple form | V-ing form |
I mustn't undertain you mustn't undertain he mustn't undertain we mustn't undertain you mustn't undertain they mustn't undertain | I mustn't be undertaining you mustn't be undertaining he mustn't be undertaining we mustn't be undertaining you mustn't be undertaining they mustn't be undertaining |
Perfect | V-ing perfect |
I mustn't have undertained you mustn't have undertained he mustn't have undertained we mustn't have undertained you mustn't have undertained they mustn't have undertained | I mustn't have been undertaining you mustn't have been undertaining he mustn't have been undertaining we mustn't have been undertaining you mustn't have been undertaining they mustn't have been undertaining |
Simple form | V-ing form |
must I undertain? must you undertain? must he undertain? must we undertain? must you undertain? must they undertain? | must I be undertaining? must you be undertaining? must he be undertaining? must we be undertaining? must you be undertaining? must they be undertaining? |
Perfect | V-ing perfect |
must I have undertained? must you have undertained? must he have undertained? must we have undertained? must you have undertained? must they have undertained? | must I have been undertaining? must you have been undertaining? must he have been undertaining? must we have been undertaining? must you have been undertaining? must they have been undertaining? |
Simple form | V-ing form |
mustn't I undertain? mustn't you undertain? mustn't he undertain? mustn't we undertain? mustn't you undertain? mustn't they undertain? | mustn't I be undertaining? mustn't you be undertaining? mustn't he be undertaining? mustn't we be undertaining? mustn't you be undertaining? mustn't they be undertaining? |
Perfect | V-ing perfect |
mustn't I have undertained? mustn't you have undertained? mustn't he have undertained? mustn't we have undertained? mustn't you have undertained? mustn't they have undertained? | mustn't I have been undertaining? mustn't you have been undertaining? mustn't he have been undertaining? mustn't we have been undertaining? mustn't you have been undertaining? mustn't they have been undertaining? |