English verb conjugation
SHOULD SHELL

Regular verb: shell - shelled - shelled

Affirmation

Simple form	V-ing form
I'd shell you'd shell he'd shell we'd shell you'd shell they'd shell	I'd be shelling you'd be shelling he'd be shelling we'd be shelling you'd be shelling they'd be shelling
Perfect	V-ing perfect
I should've shelled you should've shelled he 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 he 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
I shouldn't shell you shouldn't shell he 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 he shouldn't be shelling we shouldn't be shelling you shouldn't be shelling they shouldn't be shelling
Perfect	V-ing perfect
I shouldn't have shelled you shouldn't have shelled he 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 he 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
should I shell? should you shell? should he shell? should we shell? should you shell? should they shell?	should I be shelling? should you be shelling? should he be shelling? should we be shelling? should you be shelling? should they be shelling?
Perfect	V-ing perfect
should I have shelled? should you have shelled? should he 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 he 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
shouldn't I shell? shouldn't you shell? shouldn't he 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 he be shelling? shouldn't we be shelling? shouldn't you be shelling? shouldn't they be shelling?
Perfect	V-ing perfect
shouldn't I have shelled? shouldn't you have shelled? shouldn't he 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 he have been shelling? shouldn't we have been shelling? shouldn't you have been shelling? shouldn't they have been shelling?