English verb conjugation
SHOULD NIGGLE

Regular verb: niggle - niggled - niggled

Affirmation

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

Negation

Simple form	V-ing form
I should not niggle you should not niggle he should not niggle we should not niggle you should not niggle they should not niggle	I should not be niggling you should not be niggling he should not be niggling we should not be niggling you should not be niggling they should not be niggling
Perfect	V-ing perfect
I should not have niggled you should not have niggled he should not have niggled we should not have niggled you should not have niggled they should not have niggled	I should not have been niggling you should not have been niggling he should not have been niggling we should not have been niggling you should not have been niggling they should not 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
should I not niggle? should you not niggle? should he not niggle? should we not niggle? should you not niggle? should they not niggle?	should I not be niggling? should you not be niggling? should he not be niggling? should we not be niggling? should you not be niggling? should they not be niggling?
Perfect	V-ing perfect
should I not have niggled? should you not have niggled? should he not have niggled? should we not have niggled? should you not have niggled? should they not have niggled?	should I not have been niggling? should you not have been niggling? should he not have been niggling? should we not have been niggling? should you not have been niggling? should they not have been niggling?