English verb conjugation
COULD RIBBON

Regular verb: ribbon - ribboned - ribboned

Affirmation

Simple form	V-ing form
I could ribbon you could ribbon he could ribbon we could ribbon you could ribbon they could ribbon	I could be ribboning you could be ribboning he could be ribboning we could be ribboning you could be ribboning they could be ribboning
Perfect	V-ing perfect
I could have ribboned you could have ribboned he could have ribboned we could have ribboned you could have ribboned they could have ribboned	I could have been ribboning you could have been ribboning he could have been ribboning we could have been ribboning you could have been ribboning they could have been ribboning

Negation

Simple form	V-ing form
I could not ribbon you could not ribbon he could not ribbon we could not ribbon you could not ribbon they could not ribbon	I could not be ribboning you could not be ribboning he could not be ribboning we could not be ribboning you could not be ribboning they could not be ribboning
Perfect	V-ing perfect
I could not have ribboned you could not have ribboned he could not have ribboned we could not have ribboned you could not have ribboned they could not have ribboned	I could not have been ribboning you could not have been ribboning he could not have been ribboning we could not have been ribboning you could not have been ribboning they could not have been ribboning

Interrogative form

Simple form	V-ing form
could I ribbon? could you ribbon? could he ribbon? could we ribbon? could you ribbon? could they ribbon?	could I be ribboning? could you be ribboning? could he be ribboning? could we be ribboning? could you be ribboning? could they be ribboning?
Perfect	V-ing perfect
could I have ribboned? could you have ribboned? could he have ribboned? could we have ribboned? could you have ribboned? could they have ribboned?	could I have been ribboning? could you have been ribboning? could he have been ribboning? could we have been ribboning? could you have been ribboning? could they have been ribboning?

Interro-negative form

Simple form	V-ing form
could I not ribbon? could you not ribbon? could he not ribbon? could we not ribbon? could you not ribbon? could they not ribbon?	could I not be ribboning? could you not be ribboning? could he not be ribboning? could we not be ribboning? could you not be ribboning? could they not be ribboning?
Perfect	V-ing perfect
could I not have ribboned? could you not have ribboned? could he not have ribboned? could we not have ribboned? could you not have ribboned? could they not have ribboned?	could I not have been ribboning? could you not have been ribboning? could he not have been ribboning? could we not have been ribboning? could you not have been ribboning? could they not have been ribboning?