can stub
Regular verb: stub - stubbed- stubbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can stub
you can stub
he can stub
we can stub
you can stub
they can stub 	I can be stubbing
you can be stubbing
he can be stubbing
we can be stubbing
you can be stubbing
they can be stubbing	I can have stubbed
you can have stubbed
he can have stubbed
we can have stubbed
you can have stubbed
they can have stubbed	I can have been stubbing
you can have been stubbing
he can have been stubbing
we can have been stubbing
you can have been stubbing
they can have been stubbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't stub
you can't stub
he can't stub
we can't stub
you can't stub
they can't stub 	I can't be stubbing
you can't be stubbing
he can't be stubbing
we can't be stubbing
you can't be stubbing
they can't be stubbing	I can't have stubbed
you can't have stubbed
he can't have stubbed
we can't have stubbed
you can't have stubbed
they can't have stubbed	I can't have been stubbing
you can't have been stubbing
he can't have been stubbing
we can't have been stubbing
you can't have been stubbing
they can't have been stubbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I stub?
can you stub?
can he stub?
can we stub?
can you stub?
can they stub? 	can I be stubbing?
can you be stubbing?
can he be stubbing?
can we be stubbing?
can you be stubbing?
can they be stubbing? 	can I have stubbed?
can you have stubbed?
can he have stubbed?
can we have stubbed?
can you have stubbed?
can they have stubbed? 	can I have been stubbing?
can you have been stubbing?
can he have been stubbing?
can we have been stubbing?
can you have been stubbing?
can they have been stubbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I stub?
can't you stub?
can't he stub?
can't we stub?
can't you stub?
can't they stub? 	can't I be stubbing?
can't you be stubbing?
can't he be stubbing?
can't we be stubbing?
can't you be stubbing?
can't they be stubbing? 	can't I have stubbed?
can't you have stubbed?
can't he have stubbed?
can't we have stubbed?
can't you have stubbed?
can't they have stubbed? 	can't I have been stubbing?
can't you have been stubbing?
can't he have been stubbing?
can't we have been stubbing?
can't you have been stubbing?
can't they have been stubbing?