Conjugación del verbo inglés
COULD UNBUTTON

Verbo regular: unbutton - unbuttoned - unbuttoned

Afirmación

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

Negación

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

Forma interrogativa

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

Forma interro-negativa

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