can cumber
Regular verb: cumber - cumbered- cumbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can cumber
you can cumber
she can cumber
we can cumber
you can cumber
they can cumber 	I can be cumbering
you can be cumbering
she can be cumbering
we can be cumbering
you can be cumbering
they can be cumbering	I can have cumbered
you can have cumbered
she can have cumbered
we can have cumbered
you can have cumbered
they can have cumbered	I can have been cumbering
you can have been cumbering
she can have been cumbering
we can have been cumbering
you can have been cumbering
they can have been cumbering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't cumber
you can't cumber
she can't cumber
we can't cumber
you can't cumber
they can't cumber 	I can't be cumbering
you can't be cumbering
she can't be cumbering
we can't be cumbering
you can't be cumbering
they can't be cumbering	I can't have cumbered
you can't have cumbered
she can't have cumbered
we can't have cumbered
you can't have cumbered
they can't have cumbered	I can't have been cumbering
you can't have been cumbering
she can't have been cumbering
we can't have been cumbering
you can't have been cumbering
they can't have been cumbering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I cumber?
can you cumber?
can she cumber?
can we cumber?
can you cumber?
can they cumber? 	can I be cumbering?
can you be cumbering?
can she be cumbering?
can we be cumbering?
can you be cumbering?
can they be cumbering? 	can I have cumbered?
can you have cumbered?
can she have cumbered?
can we have cumbered?
can you have cumbered?
can they have cumbered? 	can I have been cumbering?
can you have been cumbering?
can she have been cumbering?
can we have been cumbering?
can you have been cumbering?
can they have been cumbering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I cumber?
can't you cumber?
can't she cumber?
can't we cumber?
can't you cumber?
can't they cumber? 	can't I be cumbering?
can't you be cumbering?
can't she be cumbering?
can't we be cumbering?
can't you be cumbering?
can't they be cumbering? 	can't I have cumbered?
can't you have cumbered?
can't she have cumbered?
can't we have cumbered?
can't you have cumbered?
can't they have cumbered? 	can't I have been cumbering?
can't you have been cumbering?
can't she have been cumbering?
can't we have been cumbering?
can't you have been cumbering?
can't they have been cumbering?