could cascade
Regular verb: cascade - cascaded- cascaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cascade
you could cascade
he could cascade
we could cascade
you could cascade
they could cascade 	I could be cascading
you could be cascading
he could be cascading
we could be cascading
you could be cascading
they could be cascading	I could have cascaded
you could have cascaded
he could have cascaded
we could have cascaded
you could have cascaded
they could have cascaded	I could have been cascading
you could have been cascading
he could have been cascading
we could have been cascading
you could have been cascading
they could have been cascading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cascade
you couldn't cascade
he couldn't cascade
we couldn't cascade
you couldn't cascade
they couldn't cascade 	I couldn't be cascading
you couldn't be cascading
he couldn't be cascading
we couldn't be cascading
you couldn't be cascading
they couldn't be cascading	I couldn't have cascaded
you couldn't have cascaded
he couldn't have cascaded
we couldn't have cascaded
you couldn't have cascaded
they couldn't have cascaded	I couldn't have been cascading
you couldn't have been cascading
he couldn't have been cascading
we couldn't have been cascading
you couldn't have been cascading
they couldn't have been cascading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cascade?
could you cascade?
could he cascade?
could we cascade?
could you cascade?
could they cascade? 	could I be cascading?
could you be cascading?
could he be cascading?
could we be cascading?
could you be cascading?
could they be cascading? 	could I have cascaded?
could you have cascaded?
could he have cascaded?
could we have cascaded?
could you have cascaded?
could they have cascaded? 	could I have been cascading?
could you have been cascading?
could he have been cascading?
could we have been cascading?
could you have been cascading?
could they have been cascading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cascade?
couldn't you cascade?
couldn't he cascade?
couldn't we cascade?
couldn't you cascade?
couldn't they cascade? 	couldn't I be cascading?
couldn't you be cascading?
couldn't he be cascading?
couldn't we be cascading?
couldn't you be cascading?
couldn't they be cascading? 	couldn't I have cascaded?
couldn't you have cascaded?
couldn't he have cascaded?
couldn't we have cascaded?
couldn't you have cascaded?
couldn't they have cascaded? 	couldn't I have been cascading?
couldn't you have been cascading?
couldn't he have been cascading?
couldn't we have been cascading?
couldn't you have been cascading?
couldn't they have been cascading?