English verb conjugation
COULD CUBE

Regular verb: cube - cubed - cubed

Affirmation

Simple form	V-ing form
I could cube you could cube she could cube we could cube you could cube they could cube	I could be cubing you could be cubing she could be cubing we could be cubing you could be cubing they could be cubing
Perfect	V-ing perfect
I could have cubed you could have cubed she could have cubed we could have cubed you could have cubed they could have cubed	I could have been cubing you could have been cubing she could have been cubing we could have been cubing you could have been cubing they could have been cubing

Negation

Simple form	V-ing form
I could not cube you could not cube she could not cube we could not cube you could not cube they could not cube	I could not be cubing you could not be cubing she could not be cubing we could not be cubing you could not be cubing they could not be cubing
Perfect	V-ing perfect
I could not have cubed you could not have cubed she could not have cubed we could not have cubed you could not have cubed they could not have cubed	I could not have been cubing you could not have been cubing she could not have been cubing we could not have been cubing you could not have been cubing they could not have been cubing

Interrogative form

Simple form	V-ing form
could I cube? could you cube? could she cube? could we cube? could you cube? could they cube?	could I be cubing? could you be cubing? could she be cubing? could we be cubing? could you be cubing? could they be cubing?
Perfect	V-ing perfect
could I have cubed? could you have cubed? could she have cubed? could we have cubed? could you have cubed? could they have cubed?	could I have been cubing? could you have been cubing? could she have been cubing? could we have been cubing? could you have been cubing? could they have been cubing?

Interro-negative form

Simple form	V-ing form
could I not cube? could you not cube? could she not cube? could we not cube? could you not cube? could they not cube?	could I not be cubing? could you not be cubing? could she not be cubing? could we not be cubing? could you not be cubing? could they not be cubing?
Perfect	V-ing perfect
could I not have cubed? could you not have cubed? could she not have cubed? could we not have cubed? could you not have cubed? could they not have cubed?	could I not have been cubing? could you not have been cubing? could she not have been cubing? could we not have been cubing? could you not have been cubing? could they not have been cubing?