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 can't gum you can't gum he can't gum we can't gum you can't gum they can't gum	I can't be gumming you can't be gumming he can't be gumming we can't be gumming you can't be gumming they can't be gumming
Perfect	V-ing perfect
I can't have gummed you can't have gummed he can't have gummed we can't have gummed you can't have gummed they can't have gummed	I can't have been gumming you can't have been gumming he can't have been gumming we can't have been gumming you can't have been gumming they can't 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't I gum? can't you gum? can't he gum? can't we gum? can't you gum? can't they gum?	can't I be gumming? can't you be gumming? can't he be gumming? can't we be gumming? can't you be gumming? can't they be gumming?
Perfect	V-ing perfect
can't I have gummed? can't you have gummed? can't he have gummed? can't we have gummed? can't you have gummed? can't they have gummed?	can't I have been gumming? can't you have been gumming? can't he have been gumming? can't we have been gumming? can't you have been gumming? can't they have been gumming?