should smooth
Regular verb: smooth - smoothed- smoothed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd smooth
you'd smooth
she'd smooth
we'd smooth
you'd smooth
they'd smooth 	I'd be smoothing
you'd be smoothing
she'd be smoothing
we'd be smoothing
you'd be smoothing
they'd be smoothing	I should've smoothed
you should've smoothed
she should've smoothed
we should've smoothed
you should've smoothed
they should've smoothed	I should've been smoothing
you should've been smoothing
she should've been smoothing
we should've been smoothing
you should've been smoothing
they should've been smoothing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't smooth
you shouldn't smooth
she shouldn't smooth
we shouldn't smooth
you shouldn't smooth
they shouldn't smooth 	I shouldn't be smoothing
you shouldn't be smoothing
she shouldn't be smoothing
we shouldn't be smoothing
you shouldn't be smoothing
they shouldn't be smoothing	I shouldn't have smoothed
you shouldn't have smoothed
she shouldn't have smoothed
we shouldn't have smoothed
you shouldn't have smoothed
they shouldn't have smoothed	I shouldn't have been smoothing
you shouldn't have been smoothing
she shouldn't have been smoothing
we shouldn't have been smoothing
you shouldn't have been smoothing
they shouldn't have been smoothing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I smooth?
should you smooth?
should she smooth?
should we smooth?
should you smooth?
should they smooth? 	should I be smoothing?
should you be smoothing?
should she be smoothing?
should we be smoothing?
should you be smoothing?
should they be smoothing? 	should I have smoothed?
should you have smoothed?
should she have smoothed?
should we have smoothed?
should you have smoothed?
should they have smoothed? 	should I have been smoothing?
should you have been smoothing?
should she have been smoothing?
should we have been smoothing?
should you have been smoothing?
should they have been smoothing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I smooth?
shouldn't you smooth?
shouldn't she smooth?
shouldn't we smooth?
shouldn't you smooth?
shouldn't they smooth? 	shouldn't I be smoothing?
shouldn't you be smoothing?
shouldn't she be smoothing?
shouldn't we be smoothing?
shouldn't you be smoothing?
shouldn't they be smoothing? 	shouldn't I have smoothed?
shouldn't you have smoothed?
shouldn't she have smoothed?
shouldn't we have smoothed?
shouldn't you have smoothed?
shouldn't they have smoothed? 	shouldn't I have been smoothing?
shouldn't you have been smoothing?
shouldn't she have been smoothing?
shouldn't we have been smoothing?
shouldn't you have been smoothing?
shouldn't they have been smoothing?