should smoothen
Regular verb: smoothen - smoothened- smoothened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should smoothen
you should smoothen
she should smoothen
we should smoothen
you should smoothen
they should smoothen 	I should be smoothening
you should be smoothening
she should be smoothening
we should be smoothening
you should be smoothening
they should be smoothening	I should have smoothened
you should have smoothened
she should have smoothened
we should have smoothened
you should have smoothened
they should have smoothened	I should have been smoothening
you should have been smoothening
she should have been smoothening
we should have been smoothening
you should have been smoothening
they should have been smoothening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not smoothen
you should not smoothen
she should not smoothen
we should not smoothen
you should not smoothen
they should not smoothen 	I should not be smoothening
you should not be smoothening
she should not be smoothening
we should not be smoothening
you should not be smoothening
they should not be smoothening	I should not have smoothened
you should not have smoothened
she should not have smoothened
we should not have smoothened
you should not have smoothened
they should not have smoothened	I should not have been smoothening
you should not have been smoothening
she should not have been smoothening
we should not have been smoothening
you should not have been smoothening
they should not have been smoothening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I smoothen?
should you smoothen?
should she smoothen?
should we smoothen?
should you smoothen?
should they smoothen? 	should I be smoothening?
should you be smoothening?
should she be smoothening?
should we be smoothening?
should you be smoothening?
should they be smoothening? 	should I have smoothened?
should you have smoothened?
should she have smoothened?
should we have smoothened?
should you have smoothened?
should they have smoothened? 	should I have been smoothening?
should you have been smoothening?
should she have been smoothening?
should we have been smoothening?
should you have been smoothening?
should they have been smoothening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not smoothen?
should you not smoothen?
should she not smoothen?
should we not smoothen?
should you not smoothen?
should they not smoothen? 	should I not be smoothening?
should you not be smoothening?
should she not be smoothening?
should we not be smoothening?
should you not be smoothening?
should they not be smoothening? 	should I not have smoothened?
should you not have smoothened?
should she not have smoothened?
should we not have smoothened?
should you not have smoothened?
should they not have smoothened? 	should I not have been smoothening?
should you not have been smoothening?
should she not have been smoothening?
should we not have been smoothening?
should you not have been smoothening?
should they not have been smoothening?