should kitten
Regular verb: kitten - kittened- kittened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd kitten
you'd kitten
he'd kitten
we'd kitten
you'd kitten
they'd kitten 	I'd be kittening
you'd be kittening
he'd be kittening
we'd be kittening
you'd be kittening
they'd be kittening	I should've kittened
you should've kittened
he should've kittened
we should've kittened
you should've kittened
they should've kittened	I should've been kittening
you should've been kittening
he should've been kittening
we should've been kittening
you should've been kittening
they should've been kittening	

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

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

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