English verb conjugation
COULD SLUB

Regular verb: slub - slubed - slubed

Affirmation

Simple form	V-ing form
I could slub you could slub he could slub we could slub you could slub they could slub	I could be slubing you could be slubing he could be slubing we could be slubing you could be slubing they could be slubing
Perfect	V-ing perfect
I could have slubed you could have slubed he could have slubed we could have slubed you could have slubed they could have slubed	I could have been slubing you could have been slubing he could have been slubing we could have been slubing you could have been slubing they could have been slubing

Negation

Simple form	V-ing form
I couldn't slub you couldn't slub he couldn't slub we couldn't slub you couldn't slub they couldn't slub	I couldn't be slubing you couldn't be slubing he couldn't be slubing we couldn't be slubing you couldn't be slubing they couldn't be slubing
Perfect	V-ing perfect
I couldn't have slubed you couldn't have slubed he couldn't have slubed we couldn't have slubed you couldn't have slubed they couldn't have slubed	I couldn't have been slubing you couldn't have been slubing he couldn't have been slubing we couldn't have been slubing you couldn't have been slubing they couldn't have been slubing

Interrogative form

Simple form	V-ing form
could I slub? could you slub? could he slub? could we slub? could you slub? could they slub?	could I be slubing? could you be slubing? could he be slubing? could we be slubing? could you be slubing? could they be slubing?
Perfect	V-ing perfect
could I have slubed? could you have slubed? could he have slubed? could we have slubed? could you have slubed? could they have slubed?	could I have been slubing? could you have been slubing? could he have been slubing? could we have been slubing? could you have been slubing? could they have been slubing?

Interro-negative form

Simple form	V-ing form
couldn't I slub? couldn't you slub? couldn't he slub? couldn't we slub? couldn't you slub? couldn't they slub?	couldn't I be slubing? couldn't you be slubing? couldn't he be slubing? couldn't we be slubing? couldn't you be slubing? couldn't they be slubing?
Perfect	V-ing perfect
couldn't I have slubed? couldn't you have slubed? couldn't he have slubed? couldn't we have slubed? couldn't you have slubed? couldn't they have slubed?	couldn't I have been slubing? couldn't you have been slubing? couldn't he have been slubing? couldn't we have been slubing? couldn't you have been slubing? couldn't they have been slubing?