can bum
Regular verb: bum - bummed- bummed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can bum
you can bum
she can bum
we can bum
you can bum
they can bum 	I can be bumming
you can be bumming
she can be bumming
we can be bumming
you can be bumming
they can be bumming	I can have bummed
you can have bummed
she can have bummed
we can have bummed
you can have bummed
they can have bummed	I can have been bumming
you can have been bumming
she can have been bumming
we can have been bumming
you can have been bumming
they can have been bumming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't bum
you can't bum
she can't bum
we can't bum
you can't bum
they can't bum 	I can't be bumming
you can't be bumming
she can't be bumming
we can't be bumming
you can't be bumming
they can't be bumming	I can't have bummed
you can't have bummed
she can't have bummed
we can't have bummed
you can't have bummed
they can't have bummed	I can't have been bumming
you can't have been bumming
she can't have been bumming
we can't have been bumming
you can't have been bumming
they can't have been bumming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I bum?
can you bum?
can she bum?
can we bum?
can you bum?
can they bum? 	can I be bumming?
can you be bumming?
can she be bumming?
can we be bumming?
can you be bumming?
can they be bumming? 	can I have bummed?
can you have bummed?
can she have bummed?
can we have bummed?
can you have bummed?
can they have bummed? 	can I have been bumming?
can you have been bumming?
can she have been bumming?
can we have been bumming?
can you have been bumming?
can they have been bumming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I bum?
can't you bum?
can't she bum?
can't we bum?
can't you bum?
can't they bum? 	can't I be bumming?
can't you be bumming?
can't she be bumming?
can't we be bumming?
can't you be bumming?
can't they be bumming? 	can't I have bummed?
can't you have bummed?
can't she have bummed?
can't we have bummed?
can't you have bummed?
can't they have bummed? 	can't I have been bumming?
can't you have been bumming?
can't she have been bumming?
can't we have been bumming?
can't you have been bumming?
can't they have been bumming?