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