I should march you should march she should march we should march you should march they should march
V-ing form
I should be marching you should be marching she should be marching we should be marching you should be marching they should be marching
Perfect
I should have marched you should have marched she should have marched we should have marched you should have marched they should have marched
V-ing perfect
I should have been marching you should have been marching she should have been marching we should have been marching you should have been marching they should have been marching
Negation
Simple form
I should not march you should not march she should not march we should not march you should not march they should not march
V-ing form
I should not be marching you should not be marching she should not be marching we should not be marching you should not be marching they should not be marching
Perfect
I should not have marched you should not have marched she should not have marched we should not have marched you should not have marched they should not have marched
V-ing perfect
I should not have been marching you should not have been marching she should not have been marching we should not have been marching you should not have been marching they should not have been marching
Interrogative form
Simple form
should I march? should you march? should she march? should we march? should you march? should they march?
V-ing form
should I be marching? should you be marching? should she be marching? should we be marching? should you be marching? should they be marching?
Perfect
should I have marched? should you have marched? should she have marched? should we have marched? should you have marched? should they have marched?
V-ing perfect
should I have been marching? should you have been marching? should she have been marching? should we have been marching? should you have been marching? should they have been marching?
Interro-negative form
Simple form
should I not march? should you not march? should she not march? should we not march? should you not march? should they not march?
V-ing form
should I not be marching? should you not be marching? should she not be marching? should we not be marching? should you not be marching? should they not be marching?
Perfect
should I not have marched? should you not have marched? should she not have marched? should we not have marched? should you not have marched? should they not have marched?
V-ing perfect
should I not have been marching? should you not have been marching? should she not have been marching? should we not have been marching? should you not have been marching? should they not have been marching?