can unbutton
Verbo regular: unbutton - unbuttoned- unbuttoned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can't unbutton
you can't unbutton
he can't unbutton
we can't unbutton
you can't unbutton
they can't unbutton 	I can't be unbuttoning
you can't be unbuttoning
he can't be unbuttoning
we can't be unbuttoning
you can't be unbuttoning
they can't be unbuttoning	I can't have unbuttoned
you can't have unbuttoned
he can't have unbuttoned
we can't have unbuttoned
you can't have unbuttoned
they can't have unbuttoned	I can't have been unbuttoning
you can't have been unbuttoning
he can't have been unbuttoning
we can't have been unbuttoning
you can't have been unbuttoning
they can't have been unbuttoning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can't I unbutton?
can't you unbutton?
can't he unbutton?
can't we unbutton?
can't you unbutton?
can't they unbutton? 	can't I be unbuttoning?
can't you be unbuttoning?
can't he be unbuttoning?
can't we be unbuttoning?
can't you be unbuttoning?
can't they be unbuttoning? 	can't I have unbuttoned?
can't you have unbuttoned?
can't he have unbuttoned?
can't we have unbuttoned?
can't you have unbuttoned?
can't they have unbuttoned? 	can't I have been unbuttoning?
can't you have been unbuttoning?
can't he have been unbuttoning?
can't we have been unbuttoning?
can't you have been unbuttoning?
can't they have been unbuttoning?