English verb conjugation
COULD WAG

Regular verb: wag - wagged - wagged

Affirmation

Simple form	V-ing form
I could wag you could wag he could wag we could wag you could wag they could wag	I could be wagging you could be wagging he could be wagging we could be wagging you could be wagging they could be wagging
Perfect	V-ing perfect
I could have wagged you could have wagged he could have wagged we could have wagged you could have wagged they could have wagged	I could have been wagging you could have been wagging he could have been wagging we could have been wagging you could have been wagging they could have been wagging

Negation

Simple form	V-ing form
I could not wag you could not wag he could not wag we could not wag you could not wag they could not wag	I could not be wagging you could not be wagging he could not be wagging we could not be wagging you could not be wagging they could not be wagging
Perfect	V-ing perfect
I could not have wagged you could not have wagged he could not have wagged we could not have wagged you could not have wagged they could not have wagged	I could not have been wagging you could not have been wagging he could not have been wagging we could not have been wagging you could not have been wagging they could not have been wagging

Interrogative form

Simple form	V-ing form
could I wag? could you wag? could he wag? could we wag? could you wag? could they wag?	could I be wagging? could you be wagging? could he be wagging? could we be wagging? could you be wagging? could they be wagging?
Perfect	V-ing perfect
could I have wagged? could you have wagged? could he have wagged? could we have wagged? could you have wagged? could they have wagged?	could I have been wagging? could you have been wagging? could he have been wagging? could we have been wagging? could you have been wagging? could they have been wagging?

Interro-negative form

Simple form	V-ing form
could I not wag? could you not wag? could he not wag? could we not wag? could you not wag? could they not wag?	could I not be wagging? could you not be wagging? could he not be wagging? could we not be wagging? could you not be wagging? could they not be wagging?
Perfect	V-ing perfect
could I not have wagged? could you not have wagged? could he not have wagged? could we not have wagged? could you not have wagged? could they not have wagged?	could I not have been wagging? could you not have been wagging? could he not have been wagging? could we not have been wagging? could you not have been wagging? could they not have been wagging?