English verb conjugation
SHOULD NIGGLE

Regular verb: niggle - niggled - niggled

Affirmation

Simple form	V-ing form
I'd niggle you'd niggle he'd niggle we'd niggle you'd niggle they'd niggle	I'd be niggling you'd be niggling he'd be niggling we'd be niggling you'd be niggling they'd be niggling
Perfect	V-ing perfect
I should've niggled you should've niggled he should've niggled we should've niggled you should've niggled they should've niggled	I should've been niggling you should've been niggling he should've been niggling we should've been niggling you should've been niggling they should've been niggling

Negation

Simple form	V-ing form
I shouldn't niggle you shouldn't niggle he shouldn't niggle we shouldn't niggle you shouldn't niggle they shouldn't niggle	I shouldn't be niggling you shouldn't be niggling he shouldn't be niggling we shouldn't be niggling you shouldn't be niggling they shouldn't be niggling
Perfect	V-ing perfect
I shouldn't have niggled you shouldn't have niggled he shouldn't have niggled we shouldn't have niggled you shouldn't have niggled they shouldn't have niggled	I shouldn't have been niggling you shouldn't have been niggling he shouldn't have been niggling we shouldn't have been niggling you shouldn't have been niggling they shouldn't have been niggling

Interrogative form

Simple form	V-ing form
should I niggle? should you niggle? should he niggle? should we niggle? should you niggle? should they niggle?	should I be niggling? should you be niggling? should he be niggling? should we be niggling? should you be niggling? should they be niggling?
Perfect	V-ing perfect
should I have niggled? should you have niggled? should he have niggled? should we have niggled? should you have niggled? should they have niggled?	should I have been niggling? should you have been niggling? should he have been niggling? should we have been niggling? should you have been niggling? should they have been niggling?

Interro-negative form

Simple form	V-ing form
shouldn't I niggle? shouldn't you niggle? shouldn't he niggle? shouldn't we niggle? shouldn't you niggle? shouldn't they niggle?	shouldn't I be niggling? shouldn't you be niggling? shouldn't he be niggling? shouldn't we be niggling? shouldn't you be niggling? shouldn't they be niggling?
Perfect	V-ing perfect
shouldn't I have niggled? shouldn't you have niggled? shouldn't he have niggled? shouldn't we have niggled? shouldn't you have niggled? shouldn't they have niggled?	shouldn't I have been niggling? shouldn't you have been niggling? shouldn't he have been niggling? shouldn't we have been niggling? shouldn't you have been niggling? shouldn't they have been niggling?