English verb conjugation
COULD KITTEN

Regular verb: kitten - kittened - kittened

Affirmation

Simple form	V-ing form
I could kitten you could kitten he could kitten we could kitten you could kitten they could kitten	I could be kittening you could be kittening he could be kittening we could be kittening you could be kittening they could be kittening
Perfect	V-ing perfect
I could have kittened you could have kittened he could have kittened we could have kittened you could have kittened they could have kittened	I could have been kittening you could have been kittening he could have been kittening we could have been kittening you could have been kittening they could have been kittening

Negation

Simple form	V-ing form
I couldn't kitten you couldn't kitten he couldn't kitten we couldn't kitten you couldn't kitten they couldn't kitten	I couldn't be kittening you couldn't be kittening he couldn't be kittening we couldn't be kittening you couldn't be kittening they couldn't be kittening
Perfect	V-ing perfect
I couldn't have kittened you couldn't have kittened he couldn't have kittened we couldn't have kittened you couldn't have kittened they couldn't have kittened	I couldn't have been kittening you couldn't have been kittening he couldn't have been kittening we couldn't have been kittening you couldn't have been kittening they couldn't have been kittening

Interrogative form

Simple form	V-ing form
could I kitten? could you kitten? could he kitten? could we kitten? could you kitten? could they kitten?	could I be kittening? could you be kittening? could he be kittening? could we be kittening? could you be kittening? could they be kittening?
Perfect	V-ing perfect
could I have kittened? could you have kittened? could he have kittened? could we have kittened? could you have kittened? could they have kittened?	could I have been kittening? could you have been kittening? could he have been kittening? could we have been kittening? could you have been kittening? could they have been kittening?

Interro-negative form

Simple form	V-ing form
couldn't I kitten? couldn't you kitten? couldn't he kitten? couldn't we kitten? couldn't you kitten? couldn't they kitten?	couldn't I be kittening? couldn't you be kittening? couldn't he be kittening? couldn't we be kittening? couldn't you be kittening? couldn't they be kittening?
Perfect	V-ing perfect
couldn't I have kittened? couldn't you have kittened? couldn't he have kittened? couldn't we have kittened? couldn't you have kittened? couldn't they have kittened?	couldn't I have been kittening? couldn't you have been kittening? couldn't he have been kittening? couldn't we have been kittening? couldn't you have been kittening? couldn't they have been kittening?