should sweeten
Regular verb: sweeten - sweetened- sweetened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd sweeten
you'd sweeten
he'd sweeten
we'd sweeten
you'd sweeten
they'd sweeten 	I'd be sweetening
you'd be sweetening
he'd be sweetening
we'd be sweetening
you'd be sweetening
they'd be sweetening	I should've sweetened
you should've sweetened
he should've sweetened
we should've sweetened
you should've sweetened
they should've sweetened	I should've been sweetening
you should've been sweetening
he should've been sweetening
we should've been sweetening
you should've been sweetening
they should've been sweetening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't sweeten
you shouldn't sweeten
he shouldn't sweeten
we shouldn't sweeten
you shouldn't sweeten
they shouldn't sweeten 	I shouldn't be sweetening
you shouldn't be sweetening
he shouldn't be sweetening
we shouldn't be sweetening
you shouldn't be sweetening
they shouldn't be sweetening	I shouldn't have sweetened
you shouldn't have sweetened
he shouldn't have sweetened
we shouldn't have sweetened
you shouldn't have sweetened
they shouldn't have sweetened	I shouldn't have been sweetening
you shouldn't have been sweetening
he shouldn't have been sweetening
we shouldn't have been sweetening
you shouldn't have been sweetening
they shouldn't have been sweetening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I sweeten?
should you sweeten?
should he sweeten?
should we sweeten?
should you sweeten?
should they sweeten? 	should I be sweetening?
should you be sweetening?
should he be sweetening?
should we be sweetening?
should you be sweetening?
should they be sweetening? 	should I have sweetened?
should you have sweetened?
should he have sweetened?
should we have sweetened?
should you have sweetened?
should they have sweetened? 	should I have been sweetening?
should you have been sweetening?
should he have been sweetening?
should we have been sweetening?
should you have been sweetening?
should they have been sweetening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I sweeten?
shouldn't you sweeten?
shouldn't he sweeten?
shouldn't we sweeten?
shouldn't you sweeten?
shouldn't they sweeten? 	shouldn't I be sweetening?
shouldn't you be sweetening?
shouldn't he be sweetening?
shouldn't we be sweetening?
shouldn't you be sweetening?
shouldn't they be sweetening? 	shouldn't I have sweetened?
shouldn't you have sweetened?
shouldn't he have sweetened?
shouldn't we have sweetened?
shouldn't you have sweetened?
shouldn't they have sweetened? 	shouldn't I have been sweetening?
shouldn't you have been sweetening?
shouldn't he have been sweetening?
shouldn't we have been sweetening?
shouldn't you have been sweetening?
shouldn't they have been sweetening?