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