English verb conjugation
CAN GUM

Regular verb: gum - gummed - gummed

Affirmation

Simple form	V-ing form
I can gum you can gum he can gum we can gum you can gum they can gum	I can be gumming you can be gumming he can be gumming we can be gumming you can be gumming they can be gumming
Perfect	V-ing perfect
I can have gummed you can have gummed he can have gummed we can have gummed you can have gummed they can have gummed	I can have been gumming you can have been gumming he can have been gumming we can have been gumming you can have been gumming they can have been gumming

Negation

Simple form	V-ing form
I cannot gum you cannot gum he cannot gum we cannot gum you cannot gum they cannot gum	I cannot be gumming you cannot be gumming he cannot be gumming we cannot be gumming you cannot be gumming they cannot be gumming
Perfect	V-ing perfect
I cannot have gummed you cannot have gummed he cannot have gummed we cannot have gummed you cannot have gummed they cannot have gummed	I cannot have been gumming you cannot have been gumming he cannot have been gumming we cannot have been gumming you cannot have been gumming they cannot have been gumming

Interrogative form

Simple form	V-ing form
can I gum? can you gum? can he gum? can we gum? can you gum? can they gum?	can I be gumming? can you be gumming? can he be gumming? can we be gumming? can you be gumming? can they be gumming?
Perfect	V-ing perfect
can I have gummed? can you have gummed? can he have gummed? can we have gummed? can you have gummed? can they have gummed?	can I have been gumming? can you have been gumming? can he have been gumming? can we have been gumming? can you have been gumming? can they have been gumming?

Interro-negative form

Simple form	V-ing form
can I not gum? can you not gum? can he not gum? can we not gum? can you not gum? can they not gum?	can I not be gumming? can you not be gumming? can he not be gumming? can we not be gumming? can you not be gumming? can they not be gumming?
Perfect	V-ing perfect
can I not have gummed? can you not have gummed? can he not have gummed? can we not have gummed? can you not have gummed? can they not have gummed?	can I not have been gumming? can you not have been gumming? can he not have been gumming? can we not have been gumming? can you not have been gumming? can they not have been gumming?