could corbel
Regular verb: corbel - corbeled- corbeled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could corbel
you could corbel
he could corbel
we could corbel
you could corbel
they could corbel 	I could be corbeling
you could be corbeling
he could be corbeling
we could be corbeling
you could be corbeling
they could be corbeling	I could have corbeled
you could have corbeled
he could have corbeled
we could have corbeled
you could have corbeled
they could have corbeled	I could have been corbeling
you could have been corbeling
he could have been corbeling
we could have been corbeling
you could have been corbeling
they could have been corbeling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't corbel
you couldn't corbel
he couldn't corbel
we couldn't corbel
you couldn't corbel
they couldn't corbel 	I couldn't be corbeling
you couldn't be corbeling
he couldn't be corbeling
we couldn't be corbeling
you couldn't be corbeling
they couldn't be corbeling	I couldn't have corbeled
you couldn't have corbeled
he couldn't have corbeled
we couldn't have corbeled
you couldn't have corbeled
they couldn't have corbeled	I couldn't have been corbeling
you couldn't have been corbeling
he couldn't have been corbeling
we couldn't have been corbeling
you couldn't have been corbeling
they couldn't have been corbeling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I corbel?
could you corbel?
could he corbel?
could we corbel?
could you corbel?
could they corbel? 	could I be corbeling?
could you be corbeling?
could he be corbeling?
could we be corbeling?
could you be corbeling?
could they be corbeling? 	could I have corbeled?
could you have corbeled?
could he have corbeled?
could we have corbeled?
could you have corbeled?
could they have corbeled? 	could I have been corbeling?
could you have been corbeling?
could he have been corbeling?
could we have been corbeling?
could you have been corbeling?
could they have been corbeling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I corbel?
couldn't you corbel?
couldn't he corbel?
couldn't we corbel?
couldn't you corbel?
couldn't they corbel? 	couldn't I be corbeling?
couldn't you be corbeling?
couldn't he be corbeling?
couldn't we be corbeling?
couldn't you be corbeling?
couldn't they be corbeling? 	couldn't I have corbeled?
couldn't you have corbeled?
couldn't he have corbeled?
couldn't we have corbeled?
couldn't you have corbeled?
couldn't they have corbeled? 	couldn't I have been corbeling?
couldn't you have been corbeling?
couldn't he have been corbeling?
couldn't we have been corbeling?
couldn't you have been corbeling?
couldn't they have been corbeling?