can umber
Regular verb: umber - umbered- umbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can umber
you can umber
he can umber
we can umber
you can umber
they can umber 	I can be umbering
you can be umbering
he can be umbering
we can be umbering
you can be umbering
they can be umbering	I can have umbered
you can have umbered
he can have umbered
we can have umbered
you can have umbered
they can have umbered	I can have been umbering
you can have been umbering
he can have been umbering
we can have been umbering
you can have been umbering
they can have been umbering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't umber
you can't umber
he can't umber
we can't umber
you can't umber
they can't umber 	I can't be umbering
you can't be umbering
he can't be umbering
we can't be umbering
you can't be umbering
they can't be umbering	I can't have umbered
you can't have umbered
he can't have umbered
we can't have umbered
you can't have umbered
they can't have umbered	I can't have been umbering
you can't have been umbering
he can't have been umbering
we can't have been umbering
you can't have been umbering
they can't have been umbering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I umber?
can you umber?
can he umber?
can we umber?
can you umber?
can they umber? 	can I be umbering?
can you be umbering?
can he be umbering?
can we be umbering?
can you be umbering?
can they be umbering? 	can I have umbered?
can you have umbered?
can he have umbered?
can we have umbered?
can you have umbered?
can they have umbered? 	can I have been umbering?
can you have been umbering?
can he have been umbering?
can we have been umbering?
can you have been umbering?
can they have been umbering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I umber?
can't you umber?
can't he umber?
can't we umber?
can't you umber?
can't they umber? 	can't I be umbering?
can't you be umbering?
can't he be umbering?
can't we be umbering?
can't you be umbering?
can't they be umbering? 	can't I have umbered?
can't you have umbered?
can't he have umbered?
can't we have umbered?
can't you have umbered?
can't they have umbered? 	can't I have been umbering?
can't you have been umbering?
can't he have been umbering?
can't we have been umbering?
can't you have been umbering?
can't they have been umbering?