could wane
Regular verb: wane - waned- waned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could wane
you could wane
he could wane
we could wane
you could wane
they could wane 	I could be waning
you could be waning
he could be waning
we could be waning
you could be waning
they could be waning	I could have waned
you could have waned
he could have waned
we could have waned
you could have waned
they could have waned	I could have been waning
you could have been waning
he could have been waning
we could have been waning
you could have been waning
they could have been waning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't wane
you couldn't wane
he couldn't wane
we couldn't wane
you couldn't wane
they couldn't wane 	I couldn't be waning
you couldn't be waning
he couldn't be waning
we couldn't be waning
you couldn't be waning
they couldn't be waning	I couldn't have waned
you couldn't have waned
he couldn't have waned
we couldn't have waned
you couldn't have waned
they couldn't have waned	I couldn't have been waning
you couldn't have been waning
he couldn't have been waning
we couldn't have been waning
you couldn't have been waning
they couldn't have been waning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I wane?
could you wane?
could he wane?
could we wane?
could you wane?
could they wane? 	could I be waning?
could you be waning?
could he be waning?
could we be waning?
could you be waning?
could they be waning? 	could I have waned?
could you have waned?
could he have waned?
could we have waned?
could you have waned?
could they have waned? 	could I have been waning?
could you have been waning?
could he have been waning?
could we have been waning?
could you have been waning?
could they have been waning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I wane?
couldn't you wane?
couldn't he wane?
couldn't we wane?
couldn't you wane?
couldn't they wane? 	couldn't I be waning?
couldn't you be waning?
couldn't he be waning?
couldn't we be waning?
couldn't you be waning?
couldn't they be waning? 	couldn't I have waned?
couldn't you have waned?
couldn't he have waned?
couldn't we have waned?
couldn't you have waned?
couldn't they have waned? 	couldn't I have been waning?
couldn't you have been waning?
couldn't he have been waning?
couldn't we have been waning?
couldn't you have been waning?
couldn't they have been waning?