could rebound
Regular verb: rebound - rebounded- rebounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rebound
you could rebound
he could rebound
we could rebound
you could rebound
they could rebound 	I could be rebounding
you could be rebounding
he could be rebounding
we could be rebounding
you could be rebounding
they could be rebounding	I could have rebounded
you could have rebounded
he could have rebounded
we could have rebounded
you could have rebounded
they could have rebounded	I could have been rebounding
you could have been rebounding
he could have been rebounding
we could have been rebounding
you could have been rebounding
they could have been rebounding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rebound
you couldn't rebound
he couldn't rebound
we couldn't rebound
you couldn't rebound
they couldn't rebound 	I couldn't be rebounding
you couldn't be rebounding
he couldn't be rebounding
we couldn't be rebounding
you couldn't be rebounding
they couldn't be rebounding	I couldn't have rebounded
you couldn't have rebounded
he couldn't have rebounded
we couldn't have rebounded
you couldn't have rebounded
they couldn't have rebounded	I couldn't have been rebounding
you couldn't have been rebounding
he couldn't have been rebounding
we couldn't have been rebounding
you couldn't have been rebounding
they couldn't have been rebounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rebound?
could you rebound?
could he rebound?
could we rebound?
could you rebound?
could they rebound? 	could I be rebounding?
could you be rebounding?
could he be rebounding?
could we be rebounding?
could you be rebounding?
could they be rebounding? 	could I have rebounded?
could you have rebounded?
could he have rebounded?
could we have rebounded?
could you have rebounded?
could they have rebounded? 	could I have been rebounding?
could you have been rebounding?
could he have been rebounding?
could we have been rebounding?
could you have been rebounding?
could they have been rebounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rebound?
couldn't you rebound?
couldn't he rebound?
couldn't we rebound?
couldn't you rebound?
couldn't they rebound? 	couldn't I be rebounding?
couldn't you be rebounding?
couldn't he be rebounding?
couldn't we be rebounding?
couldn't you be rebounding?
couldn't they be rebounding? 	couldn't I have rebounded?
couldn't you have rebounded?
couldn't he have rebounded?
couldn't we have rebounded?
couldn't you have rebounded?
couldn't they have rebounded? 	couldn't I have been rebounding?
couldn't you have been rebounding?
couldn't he have been rebounding?
couldn't we have been rebounding?
couldn't you have been rebounding?
couldn't they have been rebounding?