I should substitute you should substitute he should substitute we should substitute you should substitute they should substitute
V-ing form
I should be substituting you should be substituting he should be substituting we should be substituting you should be substituting they should be substituting
Perfect
I should have substituted you should have substituted he should have substituted we should have substituted you should have substituted they should have substituted
V-ing perfect
I should have been substituting you should have been substituting he should have been substituting we should have been substituting you should have been substituting they should have been substituting
Negation
Simple form
I should not substitute you should not substitute he should not substitute we should not substitute you should not substitute they should not substitute
V-ing form
I should not be substituting you should not be substituting he should not be substituting we should not be substituting you should not be substituting they should not be substituting
Perfect
I should not have substituted you should not have substituted he should not have substituted we should not have substituted you should not have substituted they should not have substituted
V-ing perfect
I should not have been substituting you should not have been substituting he should not have been substituting we should not have been substituting you should not have been substituting they should not have been substituting
Interrogative form
Simple form
should I substitute? should you substitute? should he substitute? should we substitute? should you substitute? should they substitute?
V-ing form
should I be substituting? should you be substituting? should he be substituting? should we be substituting? should you be substituting? should they be substituting?
Perfect
should I have substituted? should you have substituted? should he have substituted? should we have substituted? should you have substituted? should they have substituted?
V-ing perfect
should I have been substituting? should you have been substituting? should he have been substituting? should we have been substituting? should you have been substituting? should they have been substituting?
Interro-negative form
Simple form
should I not substitute? should you not substitute? should he not substitute? should we not substitute? should you not substitute? should they not substitute?
V-ing form
should I not be substituting? should you not be substituting? should he not be substituting? should we not be substituting? should you not be substituting? should they not be substituting?
Perfect
should I not have substituted? should you not have substituted? should he not have substituted? should we not have substituted? should you not have substituted? should they not have substituted?
V-ing perfect
should I not have been substituting? should you not have been substituting? should he not have been substituting? should we not have been substituting? should you not have been substituting? should they not have been substituting?