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 could not slub you could not slub he could not slub we could not slub you could not slub they could not slub	I could not be slubing you could not be slubing he could not be slubing we could not be slubing you could not be slubing they could not be slubing
Perfect	V-ing perfect
I could not have slubed you could not have slubed he could not have slubed we could not have slubed you could not have slubed they could not have slubed	I could not have been slubing you could not have been slubing he could not have been slubing we could not have been slubing you could not have been slubing they could not 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
could I not slub? could you not slub? could he not slub? could we not slub? could you not slub? could they not slub?	could I not be slubing? could you not be slubing? could he not be slubing? could we not be slubing? could you not be slubing? could they not be slubing?
Perfect	V-ing perfect
could I not have slubed? could you not have slubed? could he not have slubed? could we not have slubed? could you not have slubed? could they not have slubed?	could I not have been slubing? could you not have been slubing? could he not have been slubing? could we not have been slubing? could you not have been slubing? could they not have been slubing?