can gum
Regular verb: gum - gummed- gummed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?