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