English verb conjugation
COULD TUB TUB

Regular verb: tub tub - tub tubed - tub tubed

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could tub tub you could tub tub he could tub tub we could tub tub you could tub tub they could tub tub	I could be tub tubing you could be tub tubing he could be tub tubing we could be tub tubing you could be tub tubing they could be tub tubing
Perfect	V-ing perfect
I could have tub tubed you could have tub tubed he could have tub tubed we could have tub tubed you could have tub tubed they could have tub tubed	I could have been tub tubing you could have been tub tubing he could have been tub tubing we could have been tub tubing you could have been tub tubing they could have been tub tubing

Negation

Simple form	V-ing form
I could not tub tub you could not tub tub he could not tub tub we could not tub tub you could not tub tub they could not tub tub	I could not be tub tubing you could not be tub tubing he could not be tub tubing we could not be tub tubing you could not be tub tubing they could not be tub tubing
Perfect	V-ing perfect
I could not have tub tubed you could not have tub tubed he could not have tub tubed we could not have tub tubed you could not have tub tubed they could not have tub tubed	I could not have been tub tubing you could not have been tub tubing he could not have been tub tubing we could not have been tub tubing you could not have been tub tubing they could not have been tub tubing

Interrogative form

Simple form	V-ing form
could I tub tub? could you tub tub? could he tub tub? could we tub tub? could you tub tub? could they tub tub?	could I be tub tubing? could you be tub tubing? could he be tub tubing? could we be tub tubing? could you be tub tubing? could they be tub tubing?
Perfect	V-ing perfect
could I have tub tubed? could you have tub tubed? could he have tub tubed? could we have tub tubed? could you have tub tubed? could they have tub tubed?	could I have been tub tubing? could you have been tub tubing? could he have been tub tubing? could we have been tub tubing? could you have been tub tubing? could they have been tub tubing?

Interro-negative form

Simple form	V-ing form
could I not tub tub? could you not tub tub? could he not tub tub? could we not tub tub? could you not tub tub? could they not tub tub?	could I not be tub tubing? could you not be tub tubing? could he not be tub tubing? could we not be tub tubing? could you not be tub tubing? could they not be tub tubing?
Perfect	V-ing perfect
could I not have tub tubed? could you not have tub tubed? could he not have tub tubed? could we not have tub tubed? could you not have tub tubed? could they not have tub tubed?	could I not have been tub tubing? could you not have been tub tubing? could he not have been tub tubing? could we not have been tub tubing? could you not have been tub tubing? could they not have been tub tubing?