should sweeten
Regular verb: sweeten - sweetened- sweetened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should sweeten
you should sweeten
she should sweeten
we should sweeten
you should sweeten
they should sweeten 	I should be sweetening
you should be sweetening
she should be sweetening
we should be sweetening
you should be sweetening
they should be sweetening	I should have sweetened
you should have sweetened
she should have sweetened
we should have sweetened
you should have sweetened
they should have sweetened	I should have been sweetening
you should have been sweetening
she should have been sweetening
we should have been sweetening
you should have been sweetening
they should have been sweetening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not sweeten
you should not sweeten
she should not sweeten
we should not sweeten
you should not sweeten
they should not sweeten 	I should not be sweetening
you should not be sweetening
she should not be sweetening
we should not be sweetening
you should not be sweetening
they should not be sweetening	I should not have sweetened
you should not have sweetened
she should not have sweetened
we should not have sweetened
you should not have sweetened
they should not have sweetened	I should not have been sweetening
you should not have been sweetening
she should not have been sweetening
we should not have been sweetening
you should not have been sweetening
they should not have been sweetening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I sweeten?
should you sweeten?
should she sweeten?
should we sweeten?
should you sweeten?
should they sweeten? 	should I be sweetening?
should you be sweetening?
should she be sweetening?
should we be sweetening?
should you be sweetening?
should they be sweetening? 	should I have sweetened?
should you have sweetened?
should she 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 she 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 	
should I not sweeten?
should you not sweeten?
should she not sweeten?
should we not sweeten?
should you not sweeten?
should they not sweeten? 	should I not be sweetening?
should you not be sweetening?
should she not be sweetening?
should we not be sweetening?
should you not be sweetening?
should they not be sweetening? 	should I not have sweetened?
should you not have sweetened?
should she not have sweetened?
should we not have sweetened?
should you not have sweetened?
should they not have sweetened? 	should I not have been sweetening?
should you not have been sweetening?
should she not have been sweetening?
should we not have been sweetening?
should you not have been sweetening?
should they not have been sweetening?