English verb conjugation
CAN STUMP

Regular verb: stump - stumped - stumped

Affirmation

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

Negation

Simple form	V-ing form
I can't stump you can't stump he can't stump we can't stump you can't stump they can't stump	I can't be stumping you can't be stumping he can't be stumping we can't be stumping you can't be stumping they can't be stumping
Perfect	V-ing perfect
I can't have stumped you can't have stumped he can't have stumped we can't have stumped you can't have stumped they can't have stumped	I can't have been stumping you can't have been stumping he can't have been stumping we can't have been stumping you can't have been stumping they can't have been stumping

Interrogative form

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

Interro-negative form

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