English verb conjugation
CAN GUM

Regular verb: gum - gummed - gummed

Affirmation

Simple form	V-ing form
I can gum you can gum she can gum we can gum you can gum they can gum	I can be gumming you can be gumming she 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 she 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 she 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 she 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 she 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 she 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 she 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 she gum? can we gum? can you gum? can they gum?	can I be gumming? can you be gumming? can she 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 she 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 she 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 she 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 she 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 she 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 she have been gumming? can't we have been gumming? can't you have been gumming? can't they have been gumming?