English verb conjugation
CAN PUMP

Regular verb: pump - pumped - pumped

Affirmation

Simple form	V-ing form
I can pump you can pump he can pump we can pump you can pump they can pump	I can be pumping you can be pumping he can be pumping we can be pumping you can be pumping they can be pumping
Perfect	V-ing perfect
I can have pumped you can have pumped he can have pumped we can have pumped you can have pumped they can have pumped	I can have been pumping you can have been pumping he can have been pumping we can have been pumping you can have been pumping they can have been pumping

Negation

Simple form	V-ing form
I cannot pump you cannot pump he cannot pump we cannot pump you cannot pump they cannot pump	I cannot be pumping you cannot be pumping he cannot be pumping we cannot be pumping you cannot be pumping they cannot be pumping
Perfect	V-ing perfect
I cannot have pumped you cannot have pumped he cannot have pumped we cannot have pumped you cannot have pumped they cannot have pumped	I cannot have been pumping you cannot have been pumping he cannot have been pumping we cannot have been pumping you cannot have been pumping they cannot have been pumping

Interrogative form

Simple form	V-ing form
can I pump? can you pump? can he pump? can we pump? can you pump? can they pump?	can I be pumping? can you be pumping? can he be pumping? can we be pumping? can you be pumping? can they be pumping?
Perfect	V-ing perfect
can I have pumped? can you have pumped? can he have pumped? can we have pumped? can you have pumped? can they have pumped?	can I have been pumping? can you have been pumping? can he have been pumping? can we have been pumping? can you have been pumping? can they have been pumping?

Interro-negative form

Simple form	V-ing form
can I not pump? can you not pump? can he not pump? can we not pump? can you not pump? can they not pump?	can I not be pumping? can you not be pumping? can he not be pumping? can we not be pumping? can you not be pumping? can they not be pumping?
Perfect	V-ing perfect
can I not have pumped? can you not have pumped? can he not have pumped? can we not have pumped? can you not have pumped? can they not have pumped?	can I not have been pumping? can you not have been pumping? can he not have been pumping? can we not have been pumping? can you not have been pumping? can they not have been pumping?