Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could curb curb you could curb curb he could curb curb we could curb curb you could curb curb they could curb curb
V-ing form
I could be curb curbing you could be curb curbing he could be curb curbing we could be curb curbing you could be curb curbing they could be curb curbing
Perfect
I could have curb curbed you could have curb curbed he could have curb curbed we could have curb curbed you could have curb curbed they could have curb curbed
V-ing perfect
I could have been curb curbing you could have been curb curbing he could have been curb curbing we could have been curb curbing you could have been curb curbing they could have been curb curbing
Negation
Simple form
I could not curb curb you could not curb curb he could not curb curb we could not curb curb you could not curb curb they could not curb curb
V-ing form
I could not be curb curbing you could not be curb curbing he could not be curb curbing we could not be curb curbing you could not be curb curbing they could not be curb curbing
Perfect
I could not have curb curbed you could not have curb curbed he could not have curb curbed we could not have curb curbed you could not have curb curbed they could not have curb curbed
V-ing perfect
I could not have been curb curbing you could not have been curb curbing he could not have been curb curbing we could not have been curb curbing you could not have been curb curbing they could not have been curb curbing
Interrogative form
Simple form
could I curb curb? could you curb curb? could he curb curb? could we curb curb? could you curb curb? could they curb curb?
V-ing form
could I be curb curbing? could you be curb curbing? could he be curb curbing? could we be curb curbing? could you be curb curbing? could they be curb curbing?
Perfect
could I have curb curbed? could you have curb curbed? could he have curb curbed? could we have curb curbed? could you have curb curbed? could they have curb curbed?
V-ing perfect
could I have been curb curbing? could you have been curb curbing? could he have been curb curbing? could we have been curb curbing? could you have been curb curbing? could they have been curb curbing?
Interro-negative form
Simple form
could I not curb curb? could you not curb curb? could he not curb curb? could we not curb curb? could you not curb curb? could they not curb curb?
V-ing form
could I not be curb curbing? could you not be curb curbing? could he not be curb curbing? could we not be curb curbing? could you not be curb curbing? could they not be curb curbing?
Perfect
could I not have curb curbed? could you not have curb curbed? could he not have curb curbed? could we not have curb curbed? could you not have curb curbed? could they not have curb curbed?
V-ing perfect
could I not have been curb curbing? could you not have been curb curbing? could he not have been curb curbing? could we not have been curb curbing? could you not have been curb curbing? could they not have been curb curbing?