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 couldn't tub tub you couldn't tub tub he couldn't tub tub we couldn't tub tub you couldn't tub tub they couldn't tub tub	I couldn't be tub tubing you couldn't be tub tubing he couldn't be tub tubing we couldn't be tub tubing you couldn't be tub tubing they couldn't be tub tubing
Perfect	V-ing perfect
I couldn't have tub tubed you couldn't have tub tubed he couldn't have tub tubed we couldn't have tub tubed you couldn't have tub tubed they couldn't have tub tubed	I couldn't have been tub tubing you couldn't have been tub tubing he couldn't have been tub tubing we couldn't have been tub tubing you couldn't have been tub tubing they couldn't 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
couldn't I tub tub? couldn't you tub tub? couldn't he tub tub? couldn't we tub tub? couldn't you tub tub? couldn't they tub tub?	couldn't I be tub tubing? couldn't you be tub tubing? couldn't he be tub tubing? couldn't we be tub tubing? couldn't you be tub tubing? couldn't they be tub tubing?
Perfect	V-ing perfect
couldn't I have tub tubed? couldn't you have tub tubed? couldn't he have tub tubed? couldn't we have tub tubed? couldn't you have tub tubed? couldn't they have tub tubed?	couldn't I have been tub tubing? couldn't you have been tub tubing? couldn't he have been tub tubing? couldn't we have been tub tubing? couldn't you have been tub tubing? couldn't they have been tub tubing?