should sicken
Regular verb: sicken - sickened- sickened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd sicken
you'd sicken
she'd sicken
we'd sicken
you'd sicken
they'd sicken 	I'd be sickening
you'd be sickening
she'd be sickening
we'd be sickening
you'd be sickening
they'd be sickening	I should've sickened
you should've sickened
she should've sickened
we should've sickened
you should've sickened
they should've sickened	I should've been sickening
you should've been sickening
she should've been sickening
we should've been sickening
you should've been sickening
they should've been sickening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't sicken
you shouldn't sicken
she shouldn't sicken
we shouldn't sicken
you shouldn't sicken
they shouldn't sicken 	I shouldn't be sickening
you shouldn't be sickening
she shouldn't be sickening
we shouldn't be sickening
you shouldn't be sickening
they shouldn't be sickening	I shouldn't have sickened
you shouldn't have sickened
she shouldn't have sickened
we shouldn't have sickened
you shouldn't have sickened
they shouldn't have sickened	I shouldn't have been sickening
you shouldn't have been sickening
she shouldn't have been sickening
we shouldn't have been sickening
you shouldn't have been sickening
they shouldn't have been sickening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I sicken?
should you sicken?
should she sicken?
should we sicken?
should you sicken?
should they sicken? 	should I be sickening?
should you be sickening?
should she be sickening?
should we be sickening?
should you be sickening?
should they be sickening? 	should I have sickened?
should you have sickened?
should she have sickened?
should we have sickened?
should you have sickened?
should they have sickened? 	should I have been sickening?
should you have been sickening?
should she have been sickening?
should we have been sickening?
should you have been sickening?
should they have been sickening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I sicken?
shouldn't you sicken?
shouldn't she sicken?
shouldn't we sicken?
shouldn't you sicken?
shouldn't they sicken? 	shouldn't I be sickening?
shouldn't you be sickening?
shouldn't she be sickening?
shouldn't we be sickening?
shouldn't you be sickening?
shouldn't they be sickening? 	shouldn't I have sickened?
shouldn't you have sickened?
shouldn't she have sickened?
shouldn't we have sickened?
shouldn't you have sickened?
shouldn't they have sickened? 	shouldn't I have been sickening?
shouldn't you have been sickening?
shouldn't she have been sickening?
shouldn't we have been sickening?
shouldn't you have been sickening?
shouldn't they have been sickening?