English verb conjugation
COULD STUMP

Regular verb: stump - stumped - stumped

Affirmation

Simple form	V-ing form
I could stump you could stump he could stump we could stump you could stump they could stump	I could be stumping you could be stumping he could be stumping we could be stumping you could be stumping they could be stumping
Perfect	V-ing perfect
I could have stumped you could have stumped he could have stumped we could have stumped you could have stumped they could have stumped	I could have been stumping you could have been stumping he could have been stumping we could have been stumping you could have been stumping they could have been stumping

Negation

Simple form	V-ing form
I could not stump you could not stump he could not stump we could not stump you could not stump they could not stump	I could not be stumping you could not be stumping he could not be stumping we could not be stumping you could not be stumping they could not be stumping
Perfect	V-ing perfect
I could not have stumped you could not have stumped he could not have stumped we could not have stumped you could not have stumped they could not have stumped	I could not have been stumping you could not have been stumping he could not have been stumping we could not have been stumping you could not have been stumping they could not have been stumping

Interrogative form

Simple form	V-ing form
could I stump? could you stump? could he stump? could we stump? could you stump? could they stump?	could I be stumping? could you be stumping? could he be stumping? could we be stumping? could you be stumping? could they be stumping?
Perfect	V-ing perfect
could I have stumped? could you have stumped? could he have stumped? could we have stumped? could you have stumped? could they have stumped?	could I have been stumping? could you have been stumping? could he have been stumping? could we have been stumping? could you have been stumping? could they have been stumping?

Interro-negative form

Simple form	V-ing form
could I not stump? could you not stump? could he not stump? could we not stump? could you not stump? could they not stump?	could I not be stumping? could you not be stumping? could he not be stumping? could we not be stumping? could you not be stumping? could they not be stumping?
Perfect	V-ing perfect
could I not have stumped? could you not have stumped? could he not have stumped? could we not have stumped? could you not have stumped? could they not have stumped?	could I not have been stumping? could you not have been stumping? could he not have been stumping? could we not have been stumping? could you not have been stumping? could they not have been stumping?