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 cannot stump you cannot stump he cannot stump we cannot stump you cannot stump they cannot stump	I cannot be stumping you cannot be stumping he cannot be stumping we cannot be stumping you cannot be stumping they cannot be stumping
Perfect	V-ing perfect
I cannot have stumped you cannot have stumped he cannot have stumped we cannot have stumped you cannot have stumped they cannot have stumped	I cannot have been stumping you cannot have been stumping he cannot have been stumping we cannot have been stumping you cannot have been stumping they cannot 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 I not stump? can you not stump? can he not stump? can we not stump? can you not stump? can they not stump?	can I not be stumping? can you not be stumping? can he not be stumping? can we not be stumping? can you not be stumping? can they not be stumping?
Perfect	V-ing perfect
can I not have stumped? can you not have stumped? can he not have stumped? can we not have stumped? can you not have stumped? can they not have stumped?	can I not have been stumping? can you not have been stumping? can he not have been stumping? can we not have been stumping? can you not have been stumping? can they not have been stumping?