I could rebutton you could rebutton he could rebutton we could rebutton you could rebutton they could rebutton
V-ing form
I could be rebuttoning you could be rebuttoning he could be rebuttoning we could be rebuttoning you could be rebuttoning they could be rebuttoning
Perfect
I could have rebuttoned you could have rebuttoned he could have rebuttoned we could have rebuttoned you could have rebuttoned they could have rebuttoned
V-ing perfect
I could have been rebuttoning you could have been rebuttoning he could have been rebuttoning we could have been rebuttoning you could have been rebuttoning they could have been rebuttoning
Negation
Simple form
I couldn't rebutton you couldn't rebutton he couldn't rebutton we couldn't rebutton you couldn't rebutton they couldn't rebutton
V-ing form
I couldn't be rebuttoning you couldn't be rebuttoning he couldn't be rebuttoning we couldn't be rebuttoning you couldn't be rebuttoning they couldn't be rebuttoning
Perfect
I couldn't have rebuttoned you couldn't have rebuttoned he couldn't have rebuttoned we couldn't have rebuttoned you couldn't have rebuttoned they couldn't have rebuttoned
V-ing perfect
I couldn't have been rebuttoning you couldn't have been rebuttoning he couldn't have been rebuttoning we couldn't have been rebuttoning you couldn't have been rebuttoning they couldn't have been rebuttoning
Interrogative form
Simple form
could I rebutton? could you rebutton? could he rebutton? could we rebutton? could you rebutton? could they rebutton?
V-ing form
could I be rebuttoning? could you be rebuttoning? could he be rebuttoning? could we be rebuttoning? could you be rebuttoning? could they be rebuttoning?
Perfect
could I have rebuttoned? could you have rebuttoned? could he have rebuttoned? could we have rebuttoned? could you have rebuttoned? could they have rebuttoned?
V-ing perfect
could I have been rebuttoning? could you have been rebuttoning? could he have been rebuttoning? could we have been rebuttoning? could you have been rebuttoning? could they have been rebuttoning?
Interro-negative form
Simple form
couldn't I rebutton? couldn't you rebutton? couldn't he rebutton? couldn't we rebutton? couldn't you rebutton? couldn't they rebutton?
V-ing form
couldn't I be rebuttoning? couldn't you be rebuttoning? couldn't he be rebuttoning? couldn't we be rebuttoning? couldn't you be rebuttoning? couldn't they be rebuttoning?
Perfect
couldn't I have rebuttoned? couldn't you have rebuttoned? couldn't he have rebuttoned? couldn't we have rebuttoned? couldn't you have rebuttoned? couldn't they have rebuttoned?
V-ing perfect
couldn't I have been rebuttoning? couldn't you have been rebuttoning? couldn't he have been rebuttoning? couldn't we have been rebuttoning? couldn't you have been rebuttoning? couldn't they have been rebuttoning?