English verb conjugation COULD UNBUTTON

Regular verb: unbutton - unbuttoned - unbuttoned

Affirmation

Simple form

I could unbutton
you could unbutton
he could unbutton
we could unbutton
you could unbutton
they could unbutton

V-ing form

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

I could have unbuttoned
you could have unbuttoned
he could have unbuttoned
we could have unbuttoned
you could have unbuttoned
they could have unbuttoned

V-ing perfect

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

Negation

Simple form

I could not unbutton
you could not unbutton
he could not unbutton
we could not unbutton
you could not unbutton
they could not unbutton

V-ing form

I could not be unbuttoning
you could not be unbuttoning
he could not be unbuttoning
we could not be unbuttoning
you could not be unbuttoning
they could not be unbuttoning

Perfect

I could not have unbuttoned
you could not have unbuttoned
he could not have unbuttoned
we could not have unbuttoned
you could not have unbuttoned
they could not have unbuttoned

V-ing perfect

I could not have been unbuttoning
you could not have been unbuttoning
he could not have been unbuttoning
we could not have been unbuttoning
you could not have been unbuttoning
they could not have been unbuttoning

Interrogative form

Simple form

could I unbutton?
could you unbutton?
could he unbutton?
could we unbutton?
could you unbutton?
could they unbutton?

V-ing form

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

could I have unbuttoned?
could you have unbuttoned?
could he have unbuttoned?
could we have unbuttoned?
could you have unbuttoned?
could they have unbuttoned?

V-ing perfect

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?

Interro-negative form

Simple form

could I not unbutton?
could you not unbutton?
could he not unbutton?
could we not unbutton?
could you not unbutton?
could they not unbutton?

V-ing form

could I not be unbuttoning?
could you not be unbuttoning?
could he not be unbuttoning?
could we not be unbuttoning?
could you not be unbuttoning?
could they not be unbuttoning?

Perfect

could I not have unbuttoned?
could you not have unbuttoned?
could he not have unbuttoned?
could we not have unbuttoned?
could you not have unbuttoned?
could they not have unbuttoned?

V-ing perfect

could I not have been unbuttoning?
could you not have been unbuttoning?
could he not have been unbuttoning?
could we not have been unbuttoning?
could you not have been unbuttoning?
could they not have been unbuttoning?

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