English verb conjugation
CAN STUB

Regular verb: stub - stubbed - stubbed

Affirmation

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