could kitten
Regular verb: kitten - kittened- kittened

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