English verb conjugation
COULD WANE

Regular verb: wane - waned - waned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not wane you could not wane he could not wane we could not wane you could not wane they could not wane	I could not be waning you could not be waning he could not be waning we could not be waning you could not be waning they could not be waning
Perfect	V-ing perfect
I could not have waned you could not have waned he could not have waned we could not have waned you could not have waned they could not have waned	I could not have been waning you could not have been waning he could not have been waning we could not have been waning you could not have been waning they could not have been waning

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not wane? could you not wane? could he not wane? could we not wane? could you not wane? could they not wane?	could I not be waning? could you not be waning? could he not be waning? could we not be waning? could you not be waning? could they not be waning?
Perfect	V-ing perfect
could I not have waned? could you not have waned? could he not have waned? could we not have waned? could you not have waned? could they not have waned?	could I not have been waning? could you not have been waning? could he not have been waning? could we not have been waning? could you not have been waning? could they not have been waning?