English verb conjugation
SHOULD CONCERN

Regular verb: concern - concerned - concerned

Affirmation

Simple form	V-ing form
I should concern you should concern she should concern we should concern you should concern they should concern	I should be concerning you should be concerning she should be concerning we should be concerning you should be concerning they should be concerning
Perfect	V-ing perfect
I should have concerned you should have concerned she should have concerned we should have concerned you should have concerned they should have concerned	I should have been concerning you should have been concerning she should have been concerning we should have been concerning you should have been concerning they should have been concerning

Negation

Simple form	V-ing form
I should not concern you should not concern she should not concern we should not concern you should not concern they should not concern	I should not be concerning you should not be concerning she should not be concerning we should not be concerning you should not be concerning they should not be concerning
Perfect	V-ing perfect
I should not have concerned you should not have concerned she should not have concerned we should not have concerned you should not have concerned they should not have concerned	I should not have been concerning you should not have been concerning she should not have been concerning we should not have been concerning you should not have been concerning they should not have been concerning

Interrogative form

Simple form	V-ing form
should I concern? should you concern? should she concern? should we concern? should you concern? should they concern?	should I be concerning? should you be concerning? should she be concerning? should we be concerning? should you be concerning? should they be concerning?
Perfect	V-ing perfect
should I have concerned? should you have concerned? should she have concerned? should we have concerned? should you have concerned? should they have concerned?	should I have been concerning? should you have been concerning? should she have been concerning? should we have been concerning? should you have been concerning? should they have been concerning?

Interro-negative form

Simple form	V-ing form
should I not concern? should you not concern? should she not concern? should we not concern? should you not concern? should they not concern?	should I not be concerning? should you not be concerning? should she not be concerning? should we not be concerning? should you not be concerning? should they not be concerning?
Perfect	V-ing perfect
should I not have concerned? should you not have concerned? should she not have concerned? should we not have concerned? should you not have concerned? should they not have concerned?	should I not have been concerning? should you not have been concerning? should she not have been concerning? should we not have been concerning? should you not have been concerning? should they not have been concerning?