English verb conjugation
COULD FLUB

Regular verb: flub - flubed - flubed

Affirmation

Simple form	V-ing form
I could flub you could flub he could flub we could flub you could flub they could flub	I could be flubing you could be flubing he could be flubing we could be flubing you could be flubing they could be flubing
Perfect	V-ing perfect
I could have flubed you could have flubed he could have flubed we could have flubed you could have flubed they could have flubed	I could have been flubing you could have been flubing he could have been flubing we could have been flubing you could have been flubing they could have been flubing

Negation

Simple form	V-ing form
I could not flub you could not flub he could not flub we could not flub you could not flub they could not flub	I could not be flubing you could not be flubing he could not be flubing we could not be flubing you could not be flubing they could not be flubing
Perfect	V-ing perfect
I could not have flubed you could not have flubed he could not have flubed we could not have flubed you could not have flubed they could not have flubed	I could not have been flubing you could not have been flubing he could not have been flubing we could not have been flubing you could not have been flubing they could not have been flubing

Interrogative form

Simple form	V-ing form
could I flub? could you flub? could he flub? could we flub? could you flub? could they flub?	could I be flubing? could you be flubing? could he be flubing? could we be flubing? could you be flubing? could they be flubing?
Perfect	V-ing perfect
could I have flubed? could you have flubed? could he have flubed? could we have flubed? could you have flubed? could they have flubed?	could I have been flubing? could you have been flubing? could he have been flubing? could we have been flubing? could you have been flubing? could they have been flubing?

Interro-negative form

Simple form	V-ing form
could I not flub? could you not flub? could he not flub? could we not flub? could you not flub? could they not flub?	could I not be flubing? could you not be flubing? could he not be flubing? could we not be flubing? could you not be flubing? could they not be flubing?
Perfect	V-ing perfect
could I not have flubed? could you not have flubed? could he not have flubed? could we not have flubed? could you not have flubed? could they not have flubed?	could I not have been flubing? could you not have been flubing? could he not have been flubing? could we not have been flubing? could you not have been flubing? could they not have been flubing?