could volplane
Regular verb: volplane - volplaned- volplaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could volplane
you could volplane
he could volplane
we could volplane
you could volplane
they could volplane 	I could be volplaning
you could be volplaning
he could be volplaning
we could be volplaning
you could be volplaning
they could be volplaning	I could have volplaned
you could have volplaned
he could have volplaned
we could have volplaned
you could have volplaned
they could have volplaned	I could have been volplaning
you could have been volplaning
he could have been volplaning
we could have been volplaning
you could have been volplaning
they could have been volplaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't volplane
you couldn't volplane
he couldn't volplane
we couldn't volplane
you couldn't volplane
they couldn't volplane 	I couldn't be volplaning
you couldn't be volplaning
he couldn't be volplaning
we couldn't be volplaning
you couldn't be volplaning
they couldn't be volplaning	I couldn't have volplaned
you couldn't have volplaned
he couldn't have volplaned
we couldn't have volplaned
you couldn't have volplaned
they couldn't have volplaned	I couldn't have been volplaning
you couldn't have been volplaning
he couldn't have been volplaning
we couldn't have been volplaning
you couldn't have been volplaning
they couldn't have been volplaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I volplane?
could you volplane?
could he volplane?
could we volplane?
could you volplane?
could they volplane? 	could I be volplaning?
could you be volplaning?
could he be volplaning?
could we be volplaning?
could you be volplaning?
could they be volplaning? 	could I have volplaned?
could you have volplaned?
could he have volplaned?
could we have volplaned?
could you have volplaned?
could they have volplaned? 	could I have been volplaning?
could you have been volplaning?
could he have been volplaning?
could we have been volplaning?
could you have been volplaning?
could they have been volplaning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I volplane?
couldn't you volplane?
couldn't he volplane?
couldn't we volplane?
couldn't you volplane?
couldn't they volplane? 	couldn't I be volplaning?
couldn't you be volplaning?
couldn't he be volplaning?
couldn't we be volplaning?
couldn't you be volplaning?
couldn't they be volplaning? 	couldn't I have volplaned?
couldn't you have volplaned?
couldn't he have volplaned?
couldn't we have volplaned?
couldn't you have volplaned?
couldn't they have volplaned? 	couldn't I have been volplaning?
couldn't you have been volplaning?
couldn't he have been volplaning?
couldn't we have been volplaning?
couldn't you have been volplaning?
couldn't they have been volplaning?