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 couldn't stump you couldn't stump he couldn't stump we couldn't stump you couldn't stump they couldn't stump	I couldn't be stumping you couldn't be stumping he couldn't be stumping we couldn't be stumping you couldn't be stumping they couldn't be stumping
Perfect	V-ing perfect
I couldn't have stumped you couldn't have stumped he couldn't have stumped we couldn't have stumped you couldn't have stumped they couldn't have stumped	I couldn't have been stumping you couldn't have been stumping he couldn't have been stumping we couldn't have been stumping you couldn't have been stumping they couldn't 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
couldn't I stump? couldn't you stump? couldn't he stump? couldn't we stump? couldn't you stump? couldn't they stump?	couldn't I be stumping? couldn't you be stumping? couldn't he be stumping? couldn't we be stumping? couldn't you be stumping? couldn't they be stumping?
Perfect	V-ing perfect
couldn't I have stumped? couldn't you have stumped? couldn't he have stumped? couldn't we have stumped? couldn't you have stumped? couldn't they have stumped?	couldn't I have been stumping? couldn't you have been stumping? couldn't he have been stumping? couldn't we have been stumping? couldn't you have been stumping? couldn't they have been stumping?