could ribbon
Regular verb: ribbon - ribboned- ribboned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I couldn't ribbon
you couldn't ribbon
he couldn't ribbon
we couldn't ribbon
you couldn't ribbon
they couldn't ribbon 	I couldn't be ribboning
you couldn't be ribboning
he couldn't be ribboning
we couldn't be ribboning
you couldn't be ribboning
they couldn't be ribboning	I couldn't have ribboned
you couldn't have ribboned
he couldn't have ribboned
we couldn't have ribboned
you couldn't have ribboned
they couldn't have ribboned	I couldn't have been ribboning
you couldn't have been ribboning
he couldn't have been ribboning
we couldn't have been ribboning
you couldn't have been ribboning
they couldn't have been ribboning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
couldn't I ribbon?
couldn't you ribbon?
couldn't he ribbon?
couldn't we ribbon?
couldn't you ribbon?
couldn't they ribbon? 	couldn't I be ribboning?
couldn't you be ribboning?
couldn't he be ribboning?
couldn't we be ribboning?
couldn't you be ribboning?
couldn't they be ribboning? 	couldn't I have ribboned?
couldn't you have ribboned?
couldn't he have ribboned?
couldn't we have ribboned?
couldn't you have ribboned?
couldn't they have ribboned? 	couldn't I have been ribboning?
couldn't you have been ribboning?
couldn't he have been ribboning?
couldn't we have been ribboning?
couldn't you have been ribboning?
couldn't they have been ribboning?