should sharpen
Regular verb: sharpen - sharpened- sharpened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd sharpen
you'd sharpen
she'd sharpen
we'd sharpen
you'd sharpen
they'd sharpen 	I'd be sharpening
you'd be sharpening
she'd be sharpening
we'd be sharpening
you'd be sharpening
they'd be sharpening	I should've sharpened
you should've sharpened
she should've sharpened
we should've sharpened
you should've sharpened
they should've sharpened	I should've been sharpening
you should've been sharpening
she should've been sharpening
we should've been sharpening
you should've been sharpening
they should've been sharpening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't sharpen
you shouldn't sharpen
she shouldn't sharpen
we shouldn't sharpen
you shouldn't sharpen
they shouldn't sharpen 	I shouldn't be sharpening
you shouldn't be sharpening
she shouldn't be sharpening
we shouldn't be sharpening
you shouldn't be sharpening
they shouldn't be sharpening	I shouldn't have sharpened
you shouldn't have sharpened
she shouldn't have sharpened
we shouldn't have sharpened
you shouldn't have sharpened
they shouldn't have sharpened	I shouldn't have been sharpening
you shouldn't have been sharpening
she shouldn't have been sharpening
we shouldn't have been sharpening
you shouldn't have been sharpening
they shouldn't have been sharpening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I sharpen?
should you sharpen?
should she sharpen?
should we sharpen?
should you sharpen?
should they sharpen? 	should I be sharpening?
should you be sharpening?
should she be sharpening?
should we be sharpening?
should you be sharpening?
should they be sharpening? 	should I have sharpened?
should you have sharpened?
should she have sharpened?
should we have sharpened?
should you have sharpened?
should they have sharpened? 	should I have been sharpening?
should you have been sharpening?
should she have been sharpening?
should we have been sharpening?
should you have been sharpening?
should they have been sharpening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I sharpen?
shouldn't you sharpen?
shouldn't she sharpen?
shouldn't we sharpen?
shouldn't you sharpen?
shouldn't they sharpen? 	shouldn't I be sharpening?
shouldn't you be sharpening?
shouldn't she be sharpening?
shouldn't we be sharpening?
shouldn't you be sharpening?
shouldn't they be sharpening? 	shouldn't I have sharpened?
shouldn't you have sharpened?
shouldn't she have sharpened?
shouldn't we have sharpened?
shouldn't you have sharpened?
shouldn't they have sharpened? 	shouldn't I have been sharpening?
shouldn't you have been sharpening?
shouldn't she have been sharpening?
shouldn't we have been sharpening?
shouldn't you have been sharpening?
shouldn't they have been sharpening?