English verb conjugation
CAN UNBUTTON

Regular verb: unbutton - unbuttoned - unbuttoned

Affirmation

Simple form	V-ing form
I can unbutton you can unbutton he can unbutton we can unbutton you can unbutton they can unbutton	I can be unbuttoning you can be unbuttoning he can be unbuttoning we can be unbuttoning you can be unbuttoning they can be unbuttoning
Perfect	V-ing perfect
I can have unbuttoned you can have unbuttoned he can have unbuttoned we can have unbuttoned you can have unbuttoned they can have unbuttoned	I can have been unbuttoning you can have been unbuttoning he can have been unbuttoning we can have been unbuttoning you can have been unbuttoning they can have been unbuttoning

Negation

Simple form	V-ing form
I cannot unbutton you cannot unbutton he cannot unbutton we cannot unbutton you cannot unbutton they cannot unbutton	I cannot be unbuttoning you cannot be unbuttoning he cannot be unbuttoning we cannot be unbuttoning you cannot be unbuttoning they cannot be unbuttoning
Perfect	V-ing perfect
I cannot have unbuttoned you cannot have unbuttoned he cannot have unbuttoned we cannot have unbuttoned you cannot have unbuttoned they cannot have unbuttoned	I cannot have been unbuttoning you cannot have been unbuttoning he cannot have been unbuttoning we cannot have been unbuttoning you cannot have been unbuttoning they cannot have been unbuttoning

Interrogative form

Simple form	V-ing form
can I unbutton? can you unbutton? can he unbutton? can we unbutton? can you unbutton? can they unbutton?	can I be unbuttoning? can you be unbuttoning? can he be unbuttoning? can we be unbuttoning? can you be unbuttoning? can they be unbuttoning?
Perfect	V-ing perfect
can I have unbuttoned? can you have unbuttoned? can he have unbuttoned? can we have unbuttoned? can you have unbuttoned? can they have unbuttoned?	can I have been unbuttoning? can you have been unbuttoning? can he have been unbuttoning? can we have been unbuttoning? can you have been unbuttoning? can they have been unbuttoning?

Interro-negative form

Simple form	V-ing form
can I not unbutton? can you not unbutton? can he not unbutton? can we not unbutton? can you not unbutton? can they not unbutton?	can I not be unbuttoning? can you not be unbuttoning? can he not be unbuttoning? can we not be unbuttoning? can you not be unbuttoning? can they not be unbuttoning?
Perfect	V-ing perfect
can I not have unbuttoned? can you not have unbuttoned? can he not have unbuttoned? can we not have unbuttoned? can you not have unbuttoned? can they not have unbuttoned?	can I not have been unbuttoning? can you not have been unbuttoning? can he not have been unbuttoning? can we not have been unbuttoning? can you not have been unbuttoning? can they not have been unbuttoning?