could cave
Regular verb: cave - caved- caved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cave
you could cave
he could cave
we could cave
you could cave
they could cave 	I could be caving
you could be caving
he could be caving
we could be caving
you could be caving
they could be caving	I could have caved
you could have caved
he could have caved
we could have caved
you could have caved
they could have caved	I could have been caving
you could have been caving
he could have been caving
we could have been caving
you could have been caving
they could have been caving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cave
you couldn't cave
he couldn't cave
we couldn't cave
you couldn't cave
they couldn't cave 	I couldn't be caving
you couldn't be caving
he couldn't be caving
we couldn't be caving
you couldn't be caving
they couldn't be caving	I couldn't have caved
you couldn't have caved
he couldn't have caved
we couldn't have caved
you couldn't have caved
they couldn't have caved	I couldn't have been caving
you couldn't have been caving
he couldn't have been caving
we couldn't have been caving
you couldn't have been caving
they couldn't have been caving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cave?
could you cave?
could he cave?
could we cave?
could you cave?
could they cave? 	could I be caving?
could you be caving?
could he be caving?
could we be caving?
could you be caving?
could they be caving? 	could I have caved?
could you have caved?
could he have caved?
could we have caved?
could you have caved?
could they have caved? 	could I have been caving?
could you have been caving?
could he have been caving?
could we have been caving?
could you have been caving?
could they have been caving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cave?
couldn't you cave?
couldn't he cave?
couldn't we cave?
couldn't you cave?
couldn't they cave? 	couldn't I be caving?
couldn't you be caving?
couldn't he be caving?
couldn't we be caving?
couldn't you be caving?
couldn't they be caving? 	couldn't I have caved?
couldn't you have caved?
couldn't he have caved?
couldn't we have caved?
couldn't you have caved?
couldn't they have caved? 	couldn't I have been caving?
couldn't you have been caving?
couldn't he have been caving?
couldn't we have been caving?
couldn't you have been caving?
couldn't they have been caving?