should shell
Regular verb: shell - shelled- shelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd shell
you'd shell
she'd shell
we'd shell
you'd shell
they'd shell 	I'd be shelling
you'd be shelling
she'd be shelling
we'd be shelling
you'd be shelling
they'd be shelling	I should've shelled
you should've shelled
she should've shelled
we should've shelled
you should've shelled
they should've shelled	I should've been shelling
you should've been shelling
she should've been shelling
we should've been shelling
you should've been shelling
they should've been shelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't shell
you shouldn't shell
she shouldn't shell
we shouldn't shell
you shouldn't shell
they shouldn't shell 	I shouldn't be shelling
you shouldn't be shelling
she shouldn't be shelling
we shouldn't be shelling
you shouldn't be shelling
they shouldn't be shelling	I shouldn't have shelled
you shouldn't have shelled
she shouldn't have shelled
we shouldn't have shelled
you shouldn't have shelled
they shouldn't have shelled	I shouldn't have been shelling
you shouldn't have been shelling
she shouldn't have been shelling
we shouldn't have been shelling
you shouldn't have been shelling
they shouldn't have been shelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I shell?
should you shell?
should she shell?
should we shell?
should you shell?
should they shell? 	should I be shelling?
should you be shelling?
should she be shelling?
should we be shelling?
should you be shelling?
should they be shelling? 	should I have shelled?
should you have shelled?
should she have shelled?
should we have shelled?
should you have shelled?
should they have shelled? 	should I have been shelling?
should you have been shelling?
should she have been shelling?
should we have been shelling?
should you have been shelling?
should they have been shelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I shell?
shouldn't you shell?
shouldn't she shell?
shouldn't we shell?
shouldn't you shell?
shouldn't they shell? 	shouldn't I be shelling?
shouldn't you be shelling?
shouldn't she be shelling?
shouldn't we be shelling?
shouldn't you be shelling?
shouldn't they be shelling? 	shouldn't I have shelled?
shouldn't you have shelled?
shouldn't she have shelled?
shouldn't we have shelled?
shouldn't you have shelled?
shouldn't they have shelled? 	shouldn't I have been shelling?
shouldn't you have been shelling?
shouldn't she have been shelling?
shouldn't we have been shelling?
shouldn't you have been shelling?
shouldn't they have been shelling?